Exchanging notes before/after

I use this all the time, but it only works if the rest or note being exchanged is the same duration. So, if I have a quarter note that I wished to shift an eighth note in time, but the following rest is a half note, it doesn't work.

I'd love it if the program would make the adjustment for me (break the half into two quarters and then do the exchange).

It would also be nice if you could move entire selections backwards and forwards in time.