yeah, a while back I dug into the source code and existing feature requests and somehow even though they already have "shift+drag to resize brush", it would apparently require a complete brush engine rewrite for anything else, it can't be done with the current API. I don't know how that happens lol

it's been 7 years and I'm still waiting for a shortcut that lets me hold a key down and drag the brush to rotate the brush angle like you can do with the brush tip size
I took one look at the source code and came to peace with the matter
it still beats using windows