You can use GEMS to change your name.
Goto "Menu"
Click "Profile"
Click the "Profile" tab (bottom far right "Wall" "News Feed" "Profile")
Click "Change"
and there ya go!
Just don't. Pretty soon everyone on my flist will be back where they were, and some of them have started adding multiple spaces. It's incredibly annoying.
I think it's cheap and underhanded that people put a space by their name and go to the top of the neighbor list. I refuse to water anyone that does that. I don't care if people like that or not, it's my way of showing disapproval.
I skip over them. Besides, I wont water who does not water me anyway. The ones at the top of my list that do that do not return the favor anyway. They just make it easier by piling themselves up there. If there were a bitton to drop them from my list, I would.