Adding multitimbrality or making the microfreak bi-timbral would be huge!
Imagine being able to use 4 different monophonic sounds at once...it could make for a super unique sounding 4 part drum kit even??
This would normally be the deal breaker for me if I'm questioning a purchase. Fortunately for the freak it has such a unique sound to it already though, which is the number one buying priority, obviously!