[dwarfinside]

If I remember correctly: when you open a new torrent in uTorrent (seeding a new show), click on the "advanced" options tab. This window appears after you download the torrent file. Check the box marked "initial seeding". While you are in there, you should "disable DHT" (site requirement) - I think you check a box marked "private torrent" to do this.
Using this option does seem to decrease the amount I upload until other seeds are available. Seems good when the folks you are uploading to are willing to seed once they are finished. Gets everything going faster.