It would be pretty useful to change sensivity and,thus,mouse speed without going all way back to menu and return to the song list and find the song you need once again.
Why are we worrying about whether it will be useful in the long run? Most modern games allow you to access options from the pause menu. since osu doesn't do this, it should be given a key bind for convenience.Or better yet, a pause menu could be added with more options?
More stuff filled on my screen?Wireless mouse lag affects mouse sensitivity for me in osu. I have osu's sensitivity up to 1.5x. It is useful when I get more than usual mouse lag to up the sensitivity more than I normally use to counter the delay.
imo you should use the same sensitivity that you use everywhere else
Having a different sense from what you normally use in Windows (or any other OS) is just plain confusing, yet ppl use it..