Operation: Insert/Delete Bar (or other size)

Sometimes one want to change an arrangement by adding or removing bars in the middle of the song, e.g., make the bridge longer, or insert another verse. It would be very very handy to be able to insert, say, N bars at the cursor location, shifting everything after that by N bars, including markers, etc.

Similarly, I might want to delete bars, again effecting everything to the right of the current position, including markers.