It would be nice if XF could handle zip(or any other archive) files to unpack the files according to a given structure and install those. Automaticly pickup the correctly named .xml file and use that for importing of the addon. Similair to how SMF handle addons. This would make it very much easier for admins to install the addons compared to the way it is handled today. As far as I see it every addon for XF must have their own .php files so this is not something for some mods but for every mod.