You can login as user test, password pass
Set or do not set the login to be permanent.
Then click the logout button in the upper right corner, e.g. Home | News | Help | Logout
It's a lame javascript trick so it will only work for people that have javascript. Those that don't have javascript will still go to the normal login page and can logout from there as it is now.
I've only done it for dystopia for now, it will have to be done for all styles, let me know if you like it and if it's acceptable to do this for now, then I'll make diffs for the other styles as well.
The diff can be found here:
http://goathack.livejournal.org:8063/generic.look.diff.txt