I don't use the drum pads (A1-A8) as drum pads, i use them as control buttons. For example, this is one of my set ups:
A1 = Mute selected track
A2 = Solo selected track
A3 = Arm selected track for recording
A4 - Write enable selected track
A5 = Select previous track
A6 = Select next track
A7 = Bounce to track
A8 = Undo
Sliders 1-8 control tracks 1-8 (or the next 8 tracks if i press shift and the foward button on my A-Pro). They also control various synth and effect parameters when i press B2 (or B3) on my A-Pro. Incedently, you can set up the A1-A8 buttons differently for B1,B2,B3 and B4 (i never use b4 though). This gives so much control through your A-Pro.
For example, if you look at my list above for the drum pads, and think "i wouldn't use that set up", then you can press B2 (or B3 or B4) and create another set up. Be advised though that the B1-B4 buttons change focus - B1 focuses the tracks, and B2-B4 focuses VST instruments and Effects. My above list is when focus is on tracks (B1) and i have a seperate list for when i'm working on VSTs (B2) which keeps some things (muto, solo, arm, etc...) but add others (bounce to clip, for example).
My rotary controllers control track pan when in B1, and synth and effect parameters when in B2 or B3.