This is a questionable request, in that it touches on author freedom and aesthetics, but we don't actually have a thread for Discussing How Everyone Should Glowfic anyway:
I wish the screen names fit better into The Aesthetic of Assigning Characters Fictional Screen Names (Because we Used to Use Real Ones).
In particular, I have seen all of -, _, and space used as word separators. I wish that only one of the three were used. (For reference, on DW, you got only _ except when it appeared as - in domain names.)
(On the other hand, following this notion to the extreme suggests restricting fun-with-Unicode, which seems Wrong...)