Don't know if it helps, but my online boss, Rebecca Smallwood, wrote a few fanfiction module scripts which are used on slash sites like Mirrormere, Peredhil.com, Galadhrim, etc. The script I think can be found at her script site, Orodruin. It seems to be a pretty popular and easy script to use, and I'm sure there are a lot of knowledgeable people who could install it. It's a script just for the fiction, so it's not like it would be the entire site. Just a thought =)