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This has been one of the most asked question I apart from the white page of death, and yet no one in the last three years has even attempted to actually do something about.
The problem is due to the way that XOOPS deals with the mainmenu and it makes it hard just to hardcode this without a serious good hack.
My suggest would be to make a psuedo module and adding it to the main menu that way, if you look in xoops_module.php for a module it will give you a better understanding of how you can add your own pages this way. There should be a faq around explaining how this can be done.
