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Apparently, the Zeus control panel allows you to paste in Apache mod_rewrite scripts and it will translate them into it's own format (more or less successfully), but I'm guessing that your hosts don't allow you access to that :(
I've looked around, but I'm afraid I can't find any guides to the rewriting syntax, sorry...
Anyway, thanks again!
In case its of use to anyone else, here is a couple of links to the zeus web server FAQ/documentation that explains the rewrite / htaccess module functionality: