Interesting topic, as the emergency descent should be flown on automatics if possible and some busses can and do fly TCAS RAs automatically that would be indeed interesting to see that. As mentioned above the minibus can reach quite high rates of descent, i have done over 7500fpm in normal operation already, the autoflight system will probably be challenged by an RA.
I doubt ATCOs do read this forum, but you can post something on their part of pprune, and they will surely answer.