I feel the same way about pushes and RDs. I have resorted to making two copies of the song, one with and one without pushes, and then dumped the non push drum track into the pushed song (via RealBand) to make it work for me.
It has been added to the wish list to allow pushes to be assigned to user selected tracks, bar by bar or entire song. We'll see if it makes it into the next edition of BIAB.
Good luck.