Re: HTML in WIki pages
My guess is you can just find the HTML file on the server for editing the Wiki — then use some basic HTML knowledge to remove the option "Allow HTML" and replace that form element with a "hidden" field that always sets "Allow HTML" to true... Pretty basic HTML 1.0 type form stuff...
I'd be interested to know how that works out because I've considered doing the same thing on my site... However I've found that allowing HTML really opens your Wiki to more errors/bugs... That's been my general experience--the TikiWiki is not very HTML friendly... So I'm not allowing HTML at all on my site for now.