so i was playing around with kwiki, and yeah, it turns out to be /really/ easy to modify.
i just added support for mailto: links. it's running on my personal wiki on my powerbook, not on my public one, since i don't have any desire to let people post clickable spam-me signs all over my wiki, but if you want the module, just ask and i'll stick it somewhere.
honestly, it's like 20 lines of code, mostly whitespace.
this perl stuff, it's going to catch on, you mark my words...