Custom keyboard like those keyboards with AMOLED screens in each key
I have an idea which I think could be applied to the Unified Remote. There was a fancy keyboard once produced with little AMOLED screens in the keys so you could completely customise the keyboard depending on what application you were using. The problem was that it cost $2000. I was thinking you could have a cheaper version of that uses your phone and/or tablet screens. Ideally it would be able to plug into USB for lower latency. You'd be able to customise the graphics in the "keys" depending on what program you use. I can't find an app on Android which does this so I think if Unified Remote did this, it could have a unique feature?
Edit: Is this what is being described here: https://www.unifiedremote.com/tutorials/how-to-create-a-custom-keyboard-shortcuts-remote?