Jack, as much i appreciate your interest, please be aware that MIR Pro is under development, so it's too early to publish detailed feature lists.
Concept-wise, we head for a solution that allows a deep integration of MIR's underlying principles into any DAW; in its "MIR Pro"-incarnation you should be able to use it as an alternative mixing front-end then (... or as highly specialized submixer, if this is what you're after).
HTH,
/Dietz - Vienna Symphonic Library