So there's this wiseguy who vandalised Steve and Jonathan's pages. Nothing too serious, but if you want you can check what they did for yourself. Anyway, I "undid" all of their edits, so they're no longer on the Wiki. However, you might want to ban them.
I agree that templates, the main page and similar pages could be locked, but it's not a good solution for the article pages since most of them are far from "complete." What would we edit? Haha.
I'm thinking we could either reserve editing rights to registered users, as all the vandalism I've seen is from that group, or grant blocking rights and responsibilities to users up for the task (if that's possible).