Mixed case in users

I'm having an issue with the server allowing mixed case for usernames during
the commit command.
 
This causes the statistics and reports to have more then one entry for a
user.
 
For example if I commit something with mcalahan and something else with
MCalahan, the report will have two entries for me.
 
I know this is something that can be fixed by making the developers all use
lowercase, but are there any scripts to clean this up or has anyone had a
similiar issue?
 
Marc Calahan
Received on Fri May 27 17:37:15 2005