Your comments

I thought I'd opened a pull req and it had gone unnoticed. Turns out, I forgot to create the request! Created one now with a (hopefully) detailed comment. Sorry.
There's no need to "install" it on the remote server, you just need to copy one of the rmate files up and run it. There's plenty of detail on the web about how to do that already.
However, I have added some text to the README about installing the Sublime Text part locally. As I only have access to Macs, it's got a decidedly Mac-centric slant, but hopefully people on other platforms can tell me where the files are located on their OSs.

Readme is visible in the GitHub repo: https://github.com/Drarok/rsub
I've just pushed up a change that allows files in other paths to be edited (rmate classes/filename.php). :)
I've forked this and added the ruby and bash versions of rmate as subrepositories, it took me a while to realise there was no client app included in Henrik's repo. Good work, though!
https://github.com/drarok/rsub
Any chance you could throw some rough documentation into the README, Henrik? 
It's not a "reverse" SSH connection, it's a local port, tunnelled through the SSH connection. Either way, it's an *incredibly* useful feature. :)