Just a quick suggestion:
It would be great to have lcds that are also used as buttons. Maybe a multiblock with a small single button, 2 and 4 button/splitscreen.
I was just looking at the new deco projector. It has small numpad lcds, these would also be great as buttons to control the projection.
This way you would be able to add small pictograms, simple graphics or text to show what the buttons do at a glance.