Changing controls from keyboard to touch in the game

Hi everyone, I'm trying to make an fps game for multiple platforms, one of which is the Windows 8 (Store). I have one character controller for keyboard and mouse, for PC version of the game, and another controller for touch (for mobile). But on Windows 8, players can use both touch and keyboards, so I wanted to make it so they have a choice whether to choose keyboard+mouse, or touch. The thing is that I have multiple levels. Is there a way to make changes to all the levels just from the main menu? So that players don't choose that every time they enter a new level. Thank you very much in advance.