Just tried my idea still doing the same thing. So have a solution on why the game saves the settings even when deleting the game and files. My OS is Win.10.
Oh the key selection is saved in the player settings which saves in the registry (this is a unity independent feature). So you essentially can't use the mouse to open or close menus right?
Allright, found the solution. Open the Registry Editor (type Regedit in the windows bar), and look for the folder named Software, and inside there should be a folder called Mr.Z . Delete that folder and everything should be back to the defaults.