the way pro animators often do it is to start over, after they find out from the rough animatic (what you just did) how many frames they actually need.  then apply the key poses you are already using at the new properly-spaced key frames.  this can be done in some video editors, e.g. adobe CSX, where one duplicates an existing frame 10 or 20 times to space it out, but I dunno how to insert frames like that in PP2010.