Hey PerryD,
I don't currently own one but I did spend some time performing with them as a Disney musician. I've considered getting my own for inputting drum tracks as well (even though I can play a drum kit).
You have some variety of global trigger sensitivity adjustment on the zendrum itself. The software available for the Zendrum allowed users to go further by dialing in sensitivities for each isolated trigger as well. And you're able to set up (and save) a number of playing configurations as well as the sensitivity settings for each configuration.
As Torgo pointed out there is an active FB community full of plenty of people who can answer very technical questions related to the instrument and different ways to program it.
Very solid instruments (especially when they're protected from weather) and the finished are really nice. I had 7 of them to choose from at Disney. I got spoiled!
Hope that helps in some way.