is it possible to open several embedded ssh sessions to one host?
I could duplicate entries or use tmux or something at the host but I wanted to know if I'm just not finding the correct option or is it only one session per entry by design?
you can duplicate opened tabs by right-clicking on the corresponding tab and choosing "Duplicate". This will create an ad-hoc connection to the same server, you can duplicate as often as you want to:
I hope this helps.