No deep thoughts from me, just a quick observation: As a Wiki user, I would expect different art forms to be treated separately. On Wikipedia, as far as I know, the "root" of an artwork is taken into consideration, making the page "A_Scanner_Darkly" and subsequently "A_Scanner_Darkly_(film)" for the movie adaption. I don't think this is necessary for fanlore, if we'd like to emphazise equality of fanwork no matter the source of inspiration. So it would be "Title_(fanfic)" and "Title_(podfic)", no matter what came first. (I think current policy is to write just the title of the fanfic without clarification? That would mean quite some editing to change all fanfic pages, should you take this approach.)
So in short: yes to a disambiguation page and to seperate podfic/fanfic/fanart pages.

Considering that, I like Sparcicle's suggestion, because it makes it easier for me as reader to immediately get to the page I'm looking for, if I accidentially landed on the wrong one - or just to see, what else there is under that name.