Not sure if this has been suggested before but It's something I've thought about over the last little while.
I know different people have different preferences with what to display when they spar - some like nicknames, other like indicators, etc. I find that I'd prefer nicknames, however long nicks just get in the way.
My suggestion should be pretty simple: if the option is enabled, player names are removed from the nickname and only player guilds are shown. I think that this would help people like me a lot, who prefer to spar with nicknames but hate the huge nicknames filling up the screen. I think It'd be very useful for GSing.
Thoughts?