So, I hacked the site to add internal wiki page linking to BBcode, and turned off that fucking irritating default-to-wiki-formatting hack that I'd put in originally. To link to a wiki page, just enclose the page name (with underscores instead of spaces) in double square brackets, like so:
[[I_Am_Sorry,_Bio-Zombie]] becomes I Am Sorry, Bio-Zombie
If, for some reason, you want to link to a wiki page with different text than its title, just leave a space after the page name and then write the text before you close the brackets, like so:
[[Klik_of_the_Month_Klub Kotmk]] becomes Kotmk
Pretty sweet, yes?