Users of those keyboard layouts shouldn't need to reconfigure their key mapping or change the system's keyboard layout. Instead, the game should be able to get a pressed key's absolute position on the keyboard, or its "scan code". Key events don't provide that information yet.
Standardization:* Apparently [https://dvcs.w3.org/hg/d4e/raw-file/tip/source_respec.htm#keyboard-events DOM 4 Events] attempt to spec this. Idon'm not aware t know the status of any standardization effort on thisspec. I've found [http://lists.w3.org/Archives/Public/www-dom/2013JanMar/0160.html Masayuki Nakano's critique from February 2013] but don't know if there are recent developments that address his concerns.
Competition: