I have found most torrent clients can’t handle more than a few hundred torrents at a time without locking up systems.
Currently it allows you to enable more than one client however doesn’t seem to ever use the second one. Even when first client fails.
Enable by days of the week - Where you can set certain clients to be to be set as enabled / disabled automatically based on which day of the week it is.
Disable once X number of torrents - Disable a client if it has X number of active torrents
Disable if error - Disable client for X time or until manually reenabled if client becomes un responsive.