Could you add a 'change channel option' in the Mixer for MIDI files?

Hello everyone!

I have just been tinkering with MuseScore a bit and allow me to say that I am very impressed! As a screenreader user, finding score editors that are (sort of) accessible is an absolute nightmare. I am only using your software to playback MIDI files for the moment and the Mixer was a revelation as I can now finally change instruments of different tracks. Incidentally, why is it that MuseScore discovers all these little tidbits in my files that ordinary players don't (legato, staccato etc?)

I was wondering if you could possibly add an option in that Mixer that allows me to determine the channel of instruments. I am asking this because I am currently stuck with a MIDI file with a veyr annoying problem: multiple instruments play on the same channel which makes playback on normal MIDI players utterly impossible (MuseScore can handle it, though, but I have to be able to play this file in other apps too). I already know which instruments I want to move to which channels, but haven't found a program that can do this and that is screenreader-friendly. The 'export as standard MIDI file' option is not of any help here either.

Thank you very much in advance,

Vincent