Deluge
We have the seed ratio that can be set per torrent, but I would like to be able to set the upload to download ratio while the torrent is in progress. Certain trackers (such as bakatk) put emphasis on your share ratio and don't like leeching. I have no problem seeding which is why I'd like to be able to set this.
It might have been utorrent, I don't remember. But in another client you were able to base the set download limit on how much you are uploading.. It's not too much trouble to set the limits myself, I guess, but it'd be nice to have something auto-managed, ideally to leave upload at unlimited while the download limit remains fluid. I realize this probably would be minor in the development scale, just thought i'd throw the idea out there.