Paste Over

In addition to Paste Before and Paste After, would it be possible to add a Paste Over option, so that it would be possible to select range of frames in the Frames Editor, copy them and then paste the copied frames as a new layer over existing frames (starting from the selected frame). The pasted frames would then run concurrently with the existing frames, rather than being inserted before or after a particular frame.

This would open up a lot of possibilities - not least the ability to work on different aspects of scene in separate projects before pasting them together.