Hi,
In the last few months I was involved in a few editing workshops for new users. When we told people to create user accounts, they often chose usernames based on relatively common people's names, but it usually didn't happen in wikis in major language like English or Russian, so their username was accepted, as there were no other user with the same name on the same wiki. But when they entered a wiki in another major language, they had to create a new account with a different name for the obvious reasons.
How hard would it be to auto-convert to SUL all the accounts with names that exist only on one wiki, so it would appear like this name is already taken? This should prevent such problems in the future.
-- Amir Elisha Aharoni · אָמִיר אֱלִישָׁע אַהֲרוֹנִי http://aharoni.wordpress.com “We're living in pieces, I want to live in peace.” – T. Moore