Re: Embedding Stuff In A Wiki Page
If it's HTML, use the tiki-integrator. If it's php and database content, then it's actually quite easy to integrate new features - I've managed to get an email archive setup, although it's not fully integrated with menus yet.
EDIT: I misread what you wrote. I don't know how you would insert features into an actual wiki page, just into the website as a seperate page.
ewan