I'm just about to pull the trigger on a Liquid Foot Jr. for ground control. Seems to be the most powerfull option with the smallest footprint. I have little doubt that Eventide could do this better though. It would be neat to see… and I'd certainly buy one.
I'd also like to see a specially designed rack shelf for them. Like me, I'm sure a large portion of the Factor users run them through the effects loop of their amps controlled by midi as opposed to having them in the more typical pedal board role. It would really be nice to house them all in some sort of form fitted, pull out rack shelf then to simply velcro them to a generic one.