Feature Request: Support the concept of "Long Term" torrents

[UfwYde]

Typically when I run uTorrent I set it to automatically shutdown or quit when my downloads complete.

However, sometimes I'm trying to download torrents that are not currently being seeded.

I'd like to be able to keep these torrents active, but not have uTorrent stay running because of them. I would suggest being able to mark a torrent as "Long Term" when they should not block uTorrent from auto-exiting.

This way, if they happen to be available while I'm running they are downloaded, otherwise they don't interfere with my typical run/download/exit usage.