Minim tremolo with beam styling
Here are 2 issues I've found that would be solved by doing so:
#5473: Ability to change the direction of a tremolo between 2 notes
#13556: Tremolo incorrectly placed visually
Besides, that's how it's done in normal printed music: the length and orientation of the beam depends on the notes.
See Wikipedia .
The only modification would be that there should be a little separation between the vertical stem and the beam, except if the tremolo is in 2/4 notes, in which case it's treated as a completely normal beam.