(with your permission...thanks and greetings, Softcore!)
I started a scrollable keyboard. I post it because it works, but I hope someone wants to dedicate some time to improve it.
If you change the size of the global variable "octave_width", will resize the keys and put more keys on the screen.
You can move through the octaves with the red pad or with the arrows, but at the moment, it doesn´t respond perfectly it you try to combine the 2 ways of moving through the octaves.
If you only move with the arrows, or you only move with the touchpad, it should work fine.
It has some issues but maybe you find it useful. And again, if someone wants to improve it or fix some issue...please, share it!
You can also set the global variables for the MIDI target, MIDI channel and Velocity. It defaults sends Vel 127 when pressed and 0 when depressed, as usual. You could change the note on velocity, but not the note off.
I hope you like it.
Ruben