How about letting a user not have to tell the program to paste to a specific time in every instance, but instead simply input the desired # of measures after or before the current location of a clip or selection group?

Hi Todd,
Actually there IS a way to do this: Paste Special.  If you click the advanced tab, you can determine how many times you want it to copy the selected clips (and where to start this copy at). 
Comes in real handy when you want to repeat something more than once.
Hope this helps.