What you're really after is a method of sharing your upload resources such that every gets an equal number of bytes, not an equal number of files.

Is there any scope in giving those grabbing large files perhaps 1 minutes of upload time before popping them back on the tail of the upload queue ? This might be simpler to manage than multiple queues, although could slow the propogation of large files through the gnet.

Of course, what one really wants to do is favour those you're confident will in turn make the file available to others. That's a trust mechanism though, leading down the route of certificates and blacklists. Urgh.