Let's say I have a 1 measure clip and copy that clip.
 
It would be nice to be able to select a stretch of time, like say 120 measures, and then in a Paste Special option to be able to say paste and repeat/fill for the selected time range.  Right now, I can specify the measures to repeat, like put in a count.  That does work of course.
 
It would be nice to just have a selected area and be able to say fill it up with this clip I'm pasting.