I am told that both Vuze and BiglyBT have excellent queuing system functionality such that they will continue to check your torrents to see if there are any leechers and then auto-connect to these torrents. This functionality is lacking in currently-allowed torrent programs.
Vuze is proprietary so it is disqualified, but BiglyBT is open source and also multi-platform, with builds available for Windows, MacOS, Linux and Unices. BiglyBT is being actively developed, while Transmission and Deluge are aging, without the latest features that allow full use of a premium seedbox.
Many of the member-only private torrent sites that I belong to limit the number of open seeds. This is reasonable, for example, if many people with low bandwidth kept open hundreds of seeds then this would create a very large load on the tracker.
Since I have upgraded to a premium seedbox with good bandwidth I enquired the moderators at one of my torrent sites to raise my seeding limit. They replied it was built into the software and there was no such option. The policy at this particular site lets the torrent live for only a limited time with no seeders, then the torrent file is discarded, forever. I wanted to keep some particularly worthy torrents open for long-term access, even if the traffic was light. I asked the moderators if they could suspend the open seeding limit rule. I will quote the relevant parts of the conversation below:
"You could consider using Vuze or BiglyBT. These have queuing system
functionality such that they will continue to check your torrents to see
if there are any leechers and then auto-connect to these torrents. [...]"
"Thank you... ...I understand that torrents are most efficient in large swarms, and increasingly inefficient in the limit of one seeder and one leecher. I was unaware of the queuing features in Vuze and BiglyBT, unfortunately with my seedbox my choices are Deluge and Transmission
"Oh, that is a shame. I currently have 2,700 torrents queued in BiglyBT and
it seeds the top 40 which have leechers (based on the leecher to seeder