You should be able to remove M1/M2 if you aren't a mouse player which just leaves K1 K2 shown. It makes it look much cleaner, and if they were movable you could say, move them to the bottom of the screen and have them horizontal. It would look very nice, atleast to me. The game called "Hexis" which is essentially an osu! clone.. (I don't play it, but I know it's basically the exact same thing) has the keys setup like this, even though it still shows the mouse keys, example of key setup here - https://www.youtube.com/watch?v=bS1vXCBOJIA
I wouldn't say permanently have them like this, I think you should just be able to assign them somewhere on the screen similar to the progress bar options.
I wouldn't say permanently have them like this, I think you should just be able to assign them somewhere on the screen similar to the progress bar options.