Yes, i agree on that, but wouldn't it be possible to move registered users one up as well, to level 1. I think it would only require a change to do_set_restricted() and do_enforce_restricted() to keep restricted working properly in case secureops is set. Since level 1 isn't used for anything by default, it shouldn't impact anything else, should it?
Edit: since this probably will never make it into the core, i wrote a small patch that will do this (unid'd get -1 as they used to) and module to reset the some levels on all registered channels to solve side effects.
For more info, please contact me. I can't post it here since using it is unsupported and will void all anope support!
[Edited on 27-1-2008 by Viper]