diff --git a/release/scripts/ui/properties_object_constraint.py b/release/scripts/ui/properties_object_constraint.py
index 6f3cc46362f..272fc6b8c6c 100644
--- a/release/scripts/ui/properties_object_constraint.py
+++ b/release/scripts/ui/properties_object_constraint.py
@@ -706,11 +706,12 @@ class ConstraintButtonsPanel(bpy.types.Panel):
 
         col = layout.column()
         col.itemL(text="Chain Scaling:")
-        col.itemR(con, "y_scaling")
+        col.itemR(con, "y_stretch")
         if wide_ui:
             col.itemR(con, "xz_scaling_mode")
         else:
             col.itemR(con, "xz_scaling_mode", text="")
+        col.itemR(con, "use_curve_radius")
 
 
 class OBJECT_PT_constraints(ConstraintButtonsPanel):
diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index a63ff4ed599..7a1a2eec95b 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -1915,20 +1915,12 @@ static void splineik_evaluate_bone(tSplineIK_Tree *tree, Scene *scene, Object *o
 	}
 	
 	/* step 4: set the scaling factors for the axes */
-	// TODO: include a no-scale option?
 	{
 		/* only multiply the y-axis by the scaling factor to get nice volume-preservation */
 		mul_v3_fl(poseMat[1], scaleFac);
 		
 		/* set the scaling factors of the x and z axes from... */
 		switch (ikData->xzScaleMode) {
-			case CONSTRAINT_SPLINEIK_XZS_RADIUS:
-			{
-				/* radius of curve */
-				mul_v3_fl(poseMat[0], radius);
-				mul_v3_fl(poseMat[2], radius);
-			}
-				break;
 			case CONSTRAINT_SPLINEIK_XZS_ORIGINAL:
 			{
 				/* original scales get used */
@@ -1942,6 +1934,37 @@ static void splineik_evaluate_bone(tSplineIK_Tree *tree, Scene *scene, Object *o
 				mul_v3_fl(poseMat[2], scale);
 			}
 				break;
+			case CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC:
+			{
+				/* 'volume preservation' */
+				float scale;
+				
+				/* calculate volume preservation factor which is 
+				 * basically the inverse of the y-scaling factor 
+				 */
+				if (fabs(scaleFac) != 0.0f) {
+					scale= 1.0 / fabs(scaleFac);
+					
+					/* we need to clamp this within sensible values */
+					// NOTE: these should be fine for now, but should get sanitised in future
+					scale= MIN2( MAX2(scale, 0.0001) , 100000);
+				}
+				else
+					scale= 1.0f;
+				
+				/* apply the scaling */
+				mul_v3_fl(poseMat[0], scale);
+				mul_v3_fl(poseMat[2], scale);
+			}
+				break;
+		}
+		
+		/* finally, multiply the x and z scaling by the radius of the curve too, 
+		 * to allow automatic scales to get tweaked still
+		 */
+		if ((ikData->flag & CONSTRAINT_SPLINEIK_NO_CURVERAD) == 0) {
+			mul_v3_fl(poseMat[0], radius);
+			mul_v3_fl(poseMat[2], radius);
 		}
 	}
 	
diff --git a/source/blender/editors/space_view3d/view3d_edit.c b/source/blender/editors/space_view3d/view3d_edit.c
index 84cd5a31801..f53f7fdba9c 100644
--- a/source/blender/editors/space_view3d/view3d_edit.c
+++ b/source/blender/editors/space_view3d/view3d_edit.c
@@ -1235,7 +1235,6 @@ void VIEW3D_OT_view_center(wmOperatorType *ot)
 static int viewcenter_cursor_exec(bContext *C, wmOperator *op)
 {
 	View3D *v3d = CTX_wm_view3d(C);
-	ARegion *ar= CTX_wm_region(C);
 	RegionView3D *rv3d= CTX_wm_region_view3d(C);
 	Scene *scene= CTX_data_scene(C);
 	
@@ -1257,7 +1256,7 @@ static int viewcenter_cursor_exec(bContext *C, wmOperator *op)
 		}
 		
 		if (rv3d->viewlock & RV3D_BOXVIEW)
-			view3d_boxview_copy(CTX_wm_area(C), ar);
+			view3d_boxview_copy(CTX_wm_area(C), CTX_wm_region(C));
 	}
 	
 	return OPERATOR_FINISHED;
@@ -1275,7 +1274,7 @@ void VIEW3D_OT_view_center_cursor(wmOperatorType *ot)
 	ot->poll= ED_operator_view3d_active;
 	
 	/* flags */
-	ot->flag= OPTYPE_REGISTER/*|OPTYPE_UNDO*/;
+	ot->flag= 0;
 }
 
 /* ********************* Set render border operator ****************** */
diff --git a/source/blender/makesdna/DNA_constraint_types.h b/source/blender/makesdna/DNA_constraint_types.h
index df2178992a9..0476d69544a 100644
--- a/source/blender/makesdna/DNA_constraint_types.h
+++ b/source/blender/makesdna/DNA_constraint_types.h
@@ -585,16 +585,18 @@ typedef enum eSplineIK_Flags {
 	CONSTRAINT_SPLINEIK_SCALE_LIMITED	= (1<<2),
 	/* evenly distribute the bones along the path regardless of length */
 	CONSTRAINT_SPLINEIK_EVENSPLITS		= (1<<3),	
+	/* don't adjust the x and z scaling of the bones by the curve radius */
+	CONSTRAINT_SPLINEIK_NO_CURVERAD	= (1<<4),
 } eSplineIK_Flags;
 
 /* bSplineIKConstraint->xzScaleMode */
 typedef enum eSplineIK_XZScaleModes {
 	/* no x/z scaling */
 	CONSTRAINT_SPLINEIK_XZS_NONE			= 0,
-	/* bones in the chain should take their x/z scales from the curve radius */
-	CONSTRAINT_SPLINEIK_XZS_RADIUS,
 	/* bones in the chain should take their x/z scales from the original scaling */
 	CONSTRAINT_SPLINEIK_XZS_ORIGINAL,
+	/* x/z scales are the inverse of the y-scale */
+	CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC,
 } eSplineIK_XZScaleModes;
 
 /* MinMax (floor) flags */
diff --git a/source/blender/makesrna/intern/rna_constraint.c b/source/blender/makesrna/intern/rna_constraint.c
index 4d11614c1e8..9ad06ec51d9 100644
--- a/source/blender/makesrna/intern/rna_constraint.c
+++ b/source/blender/makesrna/intern/rna_constraint.c
@@ -1679,9 +1679,9 @@ static void rna_def_constraint_spline_ik(BlenderRNA *brna)
 	PropertyRNA *prop;
 	
 	static EnumPropertyItem splineik_xz_scale_mode[] = {
-		{CONSTRAINT_SPLINEIK_XZS_NONE, "NONE", 0, "Volume Preserve", "Don't scale the x and z axes, giving a volume preservation effect. (Default)"},
-		{CONSTRAINT_SPLINEIK_XZS_RADIUS, "CURVE_RADIUS", 0, "Curve Radius", "Use the radius of the curve."},
+		{CONSTRAINT_SPLINEIK_XZS_NONE, "NONE", 0, "None", "Don't scale the X and Z axes (Default)"},
 		{CONSTRAINT_SPLINEIK_XZS_ORIGINAL, "BONE_ORIGINAL", 0, "Bone Original", "Use the original scaling of the bones."},
+		{CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC, "VOLUME_PRESERVE", 0, "Volume Preservation", "Scale of the X and Z axes is the inverse of the Y-Scale."},
 		{0, NULL, 0, NULL, NULL}};
 
 	srna= RNA_def_struct(brna, "SplineIKConstraint", "Constraint");
@@ -1718,15 +1718,20 @@ static void rna_def_constraint_spline_ik(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Even Divisions", "Ignore the relative lengths of the bones when fitting to the curve.");
 	RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT, "rna_Constraint_update");
 	
-	prop= RNA_def_property(srna, "y_scaling", PROP_BOOLEAN, PROP_NONE);
+	prop= RNA_def_property(srna, "y_streching", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", CONSTRAINT_SPLINEIK_SCALE_LIMITED);
-	RNA_def_property_ui_text(prop, "Y Scaling", "Stretch the Y axis of the bones to fit the curve.");
+	RNA_def_property_ui_text(prop, "Y Stretch", "Stretch the Y axis of the bones to fit the curve.");
+	RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT, "rna_Constraint_update");
+	
+	prop= RNA_def_property(srna, "use_curve_radius", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", CONSTRAINT_SPLINEIK_NO_CURVERAD);
+	RNA_def_property_ui_text(prop, "Use Curve Radius", "Average radius of the endpoints is used to tweak the X and Z Scaling of the bones, on top of XZ Scale mode.");
 	RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT, "rna_Constraint_update");
 	
 	prop= RNA_def_property(srna, "xz_scaling_mode", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "xzScaleMode");
 	RNA_def_property_enum_items(prop, splineik_xz_scale_mode);
-	RNA_def_property_ui_text(prop, "XZ Scale Mode", "Method used for determining the scaling of the X and Z axes of the bone.");
+	RNA_def_property_ui_text(prop, "XZ Scale Mode", "Method used for determining the scaling of the X and Z axes of the bones.");
 	RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT, "rna_Constraint_update");
 }