Something that would go quite a ways to improving the 2Box Drumit 5 would be the ability to add Room Impulse Responses to kits for which one could load user created/downloaded Impulse Responses.
That way, we could simply have the close mic samples on each of our triggered elements, then we add the Room Impulse Response that takes the overall mix of the kit and applies a room sound to it. Then, we mix it into the kit to taste.
Imagine being able to record your own close mic samples, then create an Impulse Response of the room you recorded your samples in, then apply it to your kit! That'd be ridiculously powerful.