More intuitive key signatures
I wish the create a key signature function was a bit more intuitive (You have to drag and drop notes, the notes only work for one type of clef, you can't really modulate into or out of them without putting in a lot of work)
Like it seems like the groundwork exists for it to be great, but it's current version is such a hassle to work with that it's easier to just manually add accidentally (even thought that becomes tedious when you have to do it for every instance of a note).
In my particular cases, I use Db a lot and tonicizing Db natural minor leads to a key signature with a persistent Bbb. While I could technically use c# minor instead, it defeats the purpose of me wanting to tonicize Db and explore all of its colors.