Some thoughts (copied from http://en.wikipedia.org/wiki/Wikipedia_talk:Username#Clarification ):
The facts are: * for the moment, non latin accounts are blocked on sight. * in the very future, SUL will merge all accounts from the same person into one single account.
What bastique and others, including me, ask is: * blocking accounts in a different alphabet should not be the default behavior anywhere, neither on the english-language wikipedia nor on the japanese or russian ones. * If people use their account to add interwikis sometimes, there should be no problem with them keeping their non latin username. * If people are active on the project, we assume they know the language at least a little. Thus, we can ask them to use an alias (see [[Special:Preferences]] > signature) readable by the people on this project.