yeah, feeding raw does make it harder to train that way ... unless you keep a tub of parts on the counter all day and just slop them into the dog's mouth here and there as reward for good behavior!
i went to a conference in january where this was actually discussed ... someone suggested getting a ketchup/mustard squeeze bottle and feeding ground raw through that but ... bleargh.
anyway, over the years i've gone back and forth between kibble and raw a couple of times for a variety of reasons. and right now, we're feeding all three kibble ... and we started using something called Hi-Tek Naturals. it's fairly new, and the dogs seem to like it. and it's not terribly expensive, which is a nice bonus.
i never really did anything remarkable to transition them off raw. maybe a couple of days of raw in morning, kibble in evening but nothing dramatic and the switchover always went fine. but my dogs aren't super-sensitive when it comes to food, so ...