I haven't seen anywhere this might be possible, but is there an option to prevent visitors from registering with certain usernames? We're not using "Administrator" as our head honcho user and I just noticed an attempted registration with that username. I deleted it (it never went through), but I'd like to be able to prevent anyone from registering with that user in the first place (similarly, we wouldn't want people trying to register as something that would indicate they're associated with the company).
If it's not an option, it would definitely be a handy one.
Thanks!