Dunno if its possible but a similar system to F2.
The catch is that when you press that button, people would only recognize you by a nickname you set.
There'd still be the F2 option that would let people recognize your full name but that other option, say, F3(?) would only allow people to recognize you by a nickname you set. It'd have to be only one nickname, though, to prevent people from switching nicknames constantly and being a huge cluster fuck.
EDIT: Found a plugin to start this off.
http://wiki.cloudsixteen.com/PluginsGo to the middle of the clockwork section and there is a nickname plugin .rar