Yeah, I don't play piano parts on the 88es. Have and bring 88-key weighted hammer action for that. Turns out the extra keys on the 88es aren't just for notes that are heard. Key switching presets in EVB3, or switching from legato mode to poly... You can use those extra keys for all kinds of stuff, including patch up/down... That's the power of MainStage... If the song is really busy, there's more keys to map out different zones to...
I compensate for the lack of knobs and switches, and not having aftertouch either by having a novation remote sl61 mk2 in the live rig, no shortage of knobs, sliders after that!
So, my live rig consists of 3 controllers, plus the FCB...
The FCB1010 is cool, replaced three volume pedals and three sustains pedals with it. Replaced the standard ROM with the UNO chip, some gotchas in this as well, but so far with a little thinking and creative reassigning in MainStage and it all works. No USB MIDI on the thing, so I had to try several USB <> MIDI interfaces until I found one that worked that also supported external programming of the thing... But... I use it and it works, is heavy, stays put and I don't have to "chase" pedals moving around on the floor while I play!
Still amazed that m-audio thought there was any benefit to saving one input jack on that back panel, would have thought it was more economical to have the same assemble in both the 61 and the 88, with the only difference being number of keys...
Hope this all helps, ping if you have any questions!