The only real way to do it at the moment is a post template listener that manipulates the DOM. You can see this in my add-ons. XenTrader should show it. Annoying and has a performance hit in theory (could add some form of caching I guess) but the only way I have found to do it. In the future I am going to have documents so people can disable the listener doing it and explain to do the edits themselves if they see any performance drops.