FeatReq: Automatic shutdown after all uploads complete

Could there be an option for shutting down the computer automatically after all ongoing uploads are finished? This option should also include that no additional upload requests would be accepted except if session UL/DL ratio < 1. I often run into the situation that I most likely am the only holder of some rare file someone is downloading and would like to shut down as soon as the upload is complete. It'd be mean to abort since the user would have a lot of trouble finding the file somewhere else. But there's never a chance to abort nicely, since someone will always start a new download. Hence this feature request.