Good to see it being in active development. But the one feature I'm waiting for is a network whitelist. For example, it should never connect over my home or office network, but only via anonymous VPN.
(Edit: I know you can do this already with firewall rules, or containers, but I don't trust myself to not make a mistake. Ideally this should be part of the OS. You should be able to right-click somewhere in the window and say "use this network for this app".)
The other feature I'd like to see is sequential downloads, but the developers object out of principle so that is never going to come.
This is a plug-and-play solution bundling Transmission and the most common VPN configurations in a Docker container, ensuring that all torrent traffic goes via an active VPN connection. After configuring it, you just run "docker-compose up" and can then access Transmission via its web UI. It could be nice to have this built into the client, but using a container feels safer.