Every (bonus) action in that bar with jump, dash etc. should be hotkeyable.
And yes, Darth Rauko, of course the way jumping is handled in this game is totally cartoonish, unrealistic, immersion-breaking and OP, but that's just Larian unable to step out of their DOS comfort zone. After the last stream, I doubt this will get changed/fixed, so yes, at the very least, they should give us the option to hotkey it, making it at least a little tiny bit less obnoxious.