Transmission

In case of unix or any other file system able to make use of links just make a softlink between your directory of data or the filenames and whatever transmission expects. It is not a very good solution, but a workable one. Would definitly be nice to be able to set the directory for a torrent ...

The 'Too many open files' is related to 32bit applications having just 256 filedescriptors available. Whatever you do regarding rlimit as long as libc is used. You can preload /usr/lib/extendedFILE.so.1 to get around that limitation or build it as a 64bit application. There is some solaris specific ...

The daemon always uses settings.json, why not just change it there? You don't need to have all options on the command line. It is a good idea though to relocate the default config directory using -g to a place like /var/lib/transmission, having it at ${TRANSMISSION_USER_HOME}/.config/transmission ...

It would be nice though if IPv6 could be disabled in the config file, not auto-detected based on the existance of IPv6 interfaces. Including (not) getting IPv6 peers from trackers / dht / ltep.

transmission-daemon 1.76 in combination with transmission-remote-dotnet supports stop-seeding-at-ratio both on a global and a per-torrent override basis.