hello ,
I think a great feature would be the intensity control that is in the acoustic agents ,and be able to apply it to your own user files , so you could control the intensity of your user midi patterns with a rocker pedal , like a global velocity that lowers all instruments in the patterns relatively and is controllable with a midi controller or a rocking foot pedal .I use groove agent 4 with a midibuddy mp128 footpedal , the thing is awesome for groove agent 4 , I have 100+ pattern pads loaded and switch instantly between , fills , breaks ,verse , build ups etc… , all brilliant , but with assignable global intensity control and master tempo control , it would be complete control of your drums and all hands free to boot !!!
cheers !!!