I just tested out the forum with nginx in a subdirectory of my server (because I don't have a subdomain available right now) and I noticed this doesn't work correctly. The form target for the admin registration for is set to
for example, which results in a 404 for me (it should be
for me). Support for this would be pretty easy to add I think (just add an additional config option and associated template variable) and it would be a common use case IMO. What do you think?