How about instead of priority based on size, priority is based on what folder a file is in? That way you could have one folder with all your rare files and small easily downloaded files in it and another folder with your huge video files in it. The files in the low-priority folder would only be downloaded if there was bandwidth not being used by high priority stuff.

Also, could someone turn off upload limit reached messages? They make up like 99% of the messages and are the least informative.