In reply to James Koster.

Ugh! Someone had to come along and tell us that the Customizer is the way to go. I'm sorry, but I don't think it is at all. Horribly clunky, with a ton (and ever increasing number) of options that a new user is apparently supposed to negotiate. The only reason some see it as an improvement over Theme Options is that it's the same mess for everyone to negotiate. But it's still a mess.

There is no reason why the sort of thing Jason Schuller is proposing should lead to a different (and therefore confusing) default admin for each site. In fact, Iorangeo's comment here provides an idea of how this approach could look.