Add all microtonal accidentals to the accidental palette
Currently many microtonal accidentals are available as "symbols", but not as accidentals. This includes Sagittal notation, Johnston accidentals, arrows and arrowheads (which are also used as accidentals), and various other systems and extensions for microtonal notation. As far as I can see, a consequence of their unavailability as "accidentals" makes it impossible to actually use them as accidentals (i.e. contrary to accidentals from the "accidental" palette, they cannot be tuned in playback, they are not aligned properly, and they cannot be used in key signatures either).
It would be great if all of the accidentals are available in the "accidentals" palette, so they can actually be used as accidentals.