I have written a custom myspace style component that allows people to have a profile url like this:
www.MyWebsite/sampleusername
which redirects via mod rewrite to my component:
RewriteRule ^[A-Za-z0-9\$\#~%\*]+[^/]$ /myspace/index.php?x=1

The problem is that the mod rewrite does not work with JoomSEF, I am assuming I will have to modify the component itsself.

Any ideas would be appreciated

Im running into a conflict with another module and I prefer redirecting 404 errors via htacess, how can i disable the 404 function or where can I change the options for the 404.