I already know that I can mod BootmapperClient to support F13-F24 keys. By adding some code with the corresponding "keyIndex", to the "keyindex.json" and "keyindexmacro.json" files.
F13-F24's keyIndexs are 145-156.
However, what are the keyIndexes for mouse buttons? (LMB RMB MMB)
Do they have a keyIndex at all?
(I don't have a BootmapperClient compatible keyboard yet. I want to make sure before I buy one.
Since I don't have a keyboard yet, I cannot simply try every possible keyIndex one by one, to figure this out by myself.)
