Can you put some options in the driver or software to controll ilumination of controller keys at least for cmc-pd controller when you are in bank 16 custom free function mode in way to put different colors on the diferrent keys - just for a visible difference ?
good shout & this needs bumped for Chris to answer if possible! 
I did already some days ago
We are taking all the wishes from here, and have a look what is possible and what is not. More information I do not have at the moment.
Cheers,
Chris
your prompt reply is much appreciated… 
Just like the CC121 