They have released some of the source, but as my original statement said, they haven't released everything needed. There is the source to the main twrp backup/restore "engine" if you will, and then there is the graphical engine. They stated they would not be released the source to that. Now while I may disagree with that, that is their prerogative. However, they could (but won't) release a precompiled version of that code. Now seeing as I have no clue how much that code actually does, it could be that there's not much that can be done to TWRP without the source to it. Could the capacitive buttons be lit up? Definitely. Other than that, I do not know.