Emu XL-7 & MP-7 User's Group

I would love it if:

track lengths/positions could be altered in real-time, 
independantly. THis would be wicked for creating polyrhythms, or 
catching a section of one track and looping it round. 

Also, a way of switching track patterns in real time... I havent 
used it much so far but x-mix is a bit fiddly, I would like a way of 
switching quickly between different parts of a pattern, and not have 
to wait till the loop finishes - kind of like switching the 
crossfader on a dj mixer.

I wonder, is there any possibility of making the OS user-
configurable so people can program parts of it to do what they want?