I was surprised not to see midi drag/drop feature in Session Percussionist: once I have arranged the pattern, it would be very useful to drag/drop the midi pattern in my DAW for further editing and making variation. A lot of similar libraries have this feature!
Another cool possibility would be to save/recall pattern prestets between the different instruments/slot, so that I make a patter for a cajon and can use it as a baseline for a bongo.