this sounds already great and is a nice feature too, but what I meant is a little bit different! To be more precise: A B C shortcuts depending on surname above the userlist would be great. So you will have an index like
A B C D E F G ... X Y Z
When you click on the letter "G" all members with surname beginning with G will be displayed.
Hope that I described it better now.
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Likewise, I would very much like to see this feature. I can't think of how a custom plugin could do it, so I'm guessing it would either have to be a hack or a core feature in a future release.