Brion-
I haven't used it myself, but it sounds like TWiki
will be better suited
to what you're trying to do than trying to hack a different workflow
onto Wikipedia.
I advise against it. TWiki uses CamelCase, which makes it impossible to
store data in a normal form -- EverythingStartsLookingLikeThis soon
enough. It also requires registration before editing and has a terrible
user interface (with lots of curly braces and inexplicable link names).
Very geeky, lots of features, but quite user-hostile.
If you want a simple wiki, stick with UseMod. It has all the features you
need, there are lots of cool hacks, it's super-easy to set up, uses almost
the same syntax as Wikipedia (which formerly used UseMod) etc. UseMod is
still an extremely cool general purpose wiki. To see what you can
accomplish based on it, take a look at UnrealWiki, which uses a beefed up
parser and lots of CSS (the parser is open source):
http://wiki.beyondunreal.com/wiki
http://wiki.beyondunreal.com/wiki/Wookee
Regards,
Erik