Feature Request: Support for multiple piano keyboards (per instrument/section), and customize keyboard

I know that while most people don't, I enjoy using the piano keyboard at the bottom of the screen while transcribing or writing music to view how it would play out, and it is great for voicing chords between instruments. However, while this feature is great for small ensembles, for larger arrangements with more instruments this feature becomes much less useful. For example, if you have multiple percussion instruments or several different sections of instruments, the output on the keyboard can be too much to actually process. What would be best is if you can isolate some of the instruments. For this I propose two changes:
- You can create multiple piano keyboards, and perhaps they would display one on top of the other in the panel at the bottom
- For each keyboard, you can right click it to customize which instruments would be projected on it

I had initially considered using the parts to create a single part of each section I want to view and then use the piano keyboard on it, but it seems like the piano keyboard will project all instruments in the piece, disregarding the parts. (This is actually intended behavior)