I have no objection to (trying to) install MediaWiki as part of the F16 website, but I do not want to be responsible for dealing with any spam. I've found this to be a big problem with wikis in the past, and even installing those irritating "type in the word that's displayed in this image" things doesn't fully solve the problem.
That said, the F16 website's Google PageRank is pretty miserable at the moment, so we'll be very unattractive to spammers for the time being. On that subject, if you have your own webpage, please help to improve Google's opinion of us by linking to http://www.formula16.org