Yea, the current wiki signup system is far from ideal. Unfortunately spambots are a plague on wikis. A single sign on between main LW accounts would solve both spam (and better than the current setup) and the need for signing in twice, but that requires someone to implement it. There is an extension for MW, but I'm not sure how well it'd fit with the reddit based login. Maybe it'd work fine out of the box, maybe it'd be annoying.

As for your userpage not showing up.. that's odd. hmm.. I'd guess it was the old MW does not allow lowercase first usernames issue again (my userpage is also not showing up, and i have a lcfirst name), but gwern's seems to work so it's not that? Maybe it takes a while before first update?