If you just need a better looking print out, look at the print.css style sheet in the template that you're using. Much simpler and cleaner if you know css.
Action plugins are the way to go: http://wiki.splitbrain.org/wiki:action_plugins. Chris should know, he made them possible! Not only can you add your own commands but you can also extend or overwrite existing ones...martin
I expect do=print can be handled via javascript - all the action is likely to be client side, so there shouldn't be any reason to visit the server.
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