The main issue is that button presses and setting the dimmer level don't go well together; the same PIC (without interrupt capability and with 9 instructions free in the ROM) does the buttons and the mainboard>frontboard comms channel - ie, when I set a dimmer level it can miss action on the rotary control (or get the direction wrong), you can see this if you use the rotary control on the dimmer menu.

Unfortunately, this is just the way it's made. I suspect the best option is going to be for us to re-scale the dimmer menu so that the dimmest level is still readable.

Hugo