Group port forwarding
Typically when I use ssh tunnels with a remote host, I will have more than one active. I can easily do this from the command line with multiple -L or -R switches or in my .ssh/config
When I connect to a host ALL tunnels are activated at once and don't have to be individually turned on. That is how I would expect it to work in an ssh app. And how it worked in iSSH.
It appears that in Termius tunnels can be active separate from having a terminal. This may be an interesting feature, but would be more useful if you could activate them as a group, either host based or named.