Many of us still use the local help file, and this is also available online and also available through "/help command" - so community updated help would be more generic and convenient than a wiki which is only online and not linked.
That's why I said this is still a good idea, I myself still ask for the help to be updated.

/setlayer is there, /ialfill and /drawsize are quite new, that's why there aren't, anyone can add them.

#mircscripting @ irc.swiftirc.net == the best mIRC help channel