Actually, as soon as I saw that there was a hole for creating spoofed names, I created the " neshura" account myself. Not that I think that someone is going to come in and pretend to be me, but just to see if it worked, and what the behavior was when I logged in using that account. I noticed some odd behavior, such as:
I didn't look too extensively to see what other things I could and couldn't do with a {space}nick, but I'd say based on this behavior that leading spaces should definitely be stripped.