Thanks for the tip. I should have noticed this myself, as I live in Berlin (but have my keyboard set to English). Will be changing the controls to try and support Dvorak, Qwerty and Germans.
Seriously, if you haven't done it already, find or make yourself a module that lets the user customize the keyboard controls to his/her preference. Then you can just drop it into any game you write, and presto! You're good to go!
For even more gooey goodness, make up some one-click "profiles" for different keyboards that users can pick at a click. You don't need to make it top priority, and you may not even need to do all the work yourself. If you just ask for people's preferences in a forum, or a feedback form with the game itself, you can probably get a ton of helpful input.
Best of luck!