Re: Allowing users to type in Uppercase letters for the username
CSS is only a solution for display.
stwc is right.
Did you read this ?
https://buddypress.org/forums/topic/bp-fbconnect-usernames-with-foreign-characters#post-25347
there is, maybe, a solution in the post.: a plugin as below to allow non-ansi character account name
typcally a good question for @DJPaul i think…. 
