[eluser]toopay[/eluser]
But be carefull. You might be in trouble with other resource, which need uppercase character, such as images, javascript file, etc.
My suggestion is, don't modified somethings which already RIGHT. I mean, if user type the wrong character on browser addressbar, for example 'www.yoursite.com/FORUM', and they get 404 message, whats WRONG with this scenario??? User type WRONG address get error message, until user fix it, then he will get the RIGHT page.
If, you (try) anticipate this user's error by doing as you stated above, i think, that's WRONG.