I've never used one, but as far as I understand, you can trust the module just fine with midi, but you can't sign any specific sounds to the midi notes, it just triggers the sounds that you have for the kit your playing, so you would have to sign a sound to a rim or something then have the trigger io trust the rim, which you can do.
Basically it's a lot of work for little more benefit than splitters.
I'm the topic of splitters, if you try to hit the head and rim zone at the same time, no sound will play. So if you have a head and rim split you can't play both pads/sounds at the same time.
I hope that made any sense. I haven't done anything with midi, but I do have splitters on Tom 1 2 and 3