I've just finished a hack that allows admins to edit all markups from the admin page, as well as add new ones. It works quite well at my beta site and I have tried to write a complete installation guide but this is the first big hack I've done so something is probably missing. Feel free to try it out though. Any comments are much appreciated.
It is very easy to break the forums by adding markups with incorrect syntax but I haven't bothered to fix that yet. Admins should check that the new markups work anyway so I don't think it would be that big of a problem.
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