diff --git a/release/scripts/ui/space_time.py b/release/scripts/ui/space_time.py
index 65e7405c3fe..07368f9bac9 100644
--- a/release/scripts/ui/space_time.py
+++ b/release/scripts/ui/space_time.py
@@ -130,7 +130,6 @@ class TIME_MT_frame(bpy.types.Menu):
         layout.separator()
 
         sub = layout.row()
-        #sub.active = tools.enable_auto_key
         sub.menu("TIME_MT_autokey")
 
 
@@ -165,8 +164,6 @@ class TIME_MT_autokey(bpy.types.Menu):
         layout = self.layout
         tools = context.tool_settings
 
-        layout.active = tools.enable_auto_key
-
         layout.prop_enum(tools, "autokey_mode", 'ADD_REPLACE_KEYS')
         layout.prop_enum(tools, "autokey_mode", 'REPLACE_KEYS')
 
diff --git a/source/blender/editors/animation/keyframing.c b/source/blender/editors/animation/keyframing.c
index 1eb2a82cccf..979502e0bf4 100644
--- a/source/blender/editors/animation/keyframing.c
+++ b/source/blender/editors/animation/keyframing.c
@@ -222,10 +222,12 @@ int insert_bezt_fcurve (FCurve *fcu, BezTriple *bezt, short flag)
 {
 	int i= 0;
 	
+	/* are there already keyframes? */
 	if (fcu->bezt) {
 		short replace = -1;
 		i = binarysearch_bezt_index(fcu->bezt, bezt->vec[1][0], fcu->totvert, &replace);
 		
+		/* replace an existing keyframe? */
 		if (replace) {			
 			/* sanity check: 'i' may in rare cases exceed arraylen */
 			if ((i >= 0) && (i < fcu->totvert)) {
@@ -252,6 +254,7 @@ int insert_bezt_fcurve (FCurve *fcu, BezTriple *bezt, short flag)
 				}
 			}
 		}
+		/* keyframing modes allow to not replace keyframe */
 		else if ((flag & INSERTKEY_REPLACE) == 0) {
 			/* insert new - if we're not restricted to replacing keyframes only */
 			BezTriple *newb= MEM_callocN((fcu->totvert+1)*sizeof(BezTriple), "beztriple");
@@ -270,16 +273,27 @@ int insert_bezt_fcurve (FCurve *fcu, BezTriple *bezt, short flag)
 			/* replace (+ free) old with new, only if necessary to do so */
 			MEM_freeN(fcu->bezt);
 			fcu->bezt= newb;
-				
+			
 			fcu->totvert++;
 		}
 	}
-	else {
-		// TODO: need to check for old sample-data now...
+	/* no keyframes already, but can only add if...
+	 *	1) keyframing modes say that keyframes can only be replaced, so adding new ones won't know
+	 *	2) there are no samples on the curve
+	 *		// NOTE: maybe we may want to allow this later when doing samples -> bezt conversions, 
+	 *		// but for now, having both is asking for trouble
+	 */
+	else if ((flag & INSERTKEY_REPLACE)==0 && (fcu->fpt==NULL)) {
+		/* create new keyframes array */
 		fcu->bezt= MEM_callocN(sizeof(BezTriple), "beztriple");
 		*(fcu->bezt)= *bezt;
 		fcu->totvert= 1;
 	}
+	/* cannot add anything */
+	else {
+		/* return error code -1 to prevent any misunderstandings */
+		return -1;
+	}
 	
 	
 	/* we need to return the index, so that some tools which do post-processing can 
diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index 2771e6315c8..2b500321dfe 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -791,34 +791,12 @@ static void recurs_del_seq_flag(Scene *scene, ListBase *lb, short flag, short de
 static Sequence *dupli_seq(struct Scene *scene, Sequence *seq)
 {
 	Sequence *seqn = MEM_dupallocN(seq);
-	// XXX animato: ID *id;
 
 	seq->tmp = seqn;
-		
 	seqn->strip= MEM_dupallocN(seq->strip);
 
-	// XXX animato
-#if 0
-	if (seqn->ipo) {
-		if (U.dupflag & USER_DUP_IPO) {
-			id= (ID *)seqn->ipo;
-			seqn->ipo= copy_ipo(seqn->ipo);
-			/* we don't need to decrease the number
-			 * of the ipo because we never increase it,
-			 * for example, adduplicate need decrease
-			 * the number but only because copy_object
-			 * call id_us_plus for the ipo block and
-			 * single_ipo_users only work if id->us > 1.
-			 *
-			 * need call ipo_idnew here, for drivers ??
-			 * - Diego
-			 */
-		}
-		else
-			seqn->ipo->id.us++;
-	}
-#endif
-
+	// XXX: add F-Curve duplication stuff?
+		
 	seqn->strip->tstripdata = 0;
 	seqn->strip->tstripdata_startstill = 0;
 	seqn->strip->tstripdata_endstill = 0;