Good suggestion but might be a bit tough. Because some of the sort by options on the user list aren't done alphabetially, so if you are sorting by registration date then this would not work. Also, since this is a multi-language program many foreign usernames don't even use our a-z letters.
This is one of those things where eventually I may be able to come up with an idea on how to actually do it, but not enough time for 5.1.
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Scream
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