No, you can tunnel already. I do it all the time to connect pgadmin to our production machines.
Connect to the remote machine from your os, with the ssh command. You can use "-p 2222" to specify the non-standard port, and "-D 6432" to specify which port to tunnel, for the database traffic. I'll share the exact command I use on Monday, if you like, as it's on my work computer. Anyway, then you just connect pgadmin to a server on localhost, running on that tunneled port. Works great. :)
(I'm assuming you're using a real OS. No idea how to do it in Windows, or if you can even do it.)
Thank you. I already knew that. Note that Stephen was asking about a UI part of pgAdmin, not if it was possible to use an SSH tunnel outside of pgAdmin.