I like how the BeatBuddy Manager lets you have multiple MIDI songs for each Drum Fill. I also like the ability to randomize or sequence the songs.
It seems to me the multiple MIDI songs feature could also be used in the transition fill and foot switch area. This would allow different transitions and also different hits on the foot switch. It would be less monotonous and more like a real drummer. It also would add very little complexity to making songs. Use it if you like, ignore it to keep things simple.