I have released an update Sublime Text plugin, based on the work of Adam (with his permission).
It now has an automatic installer written in Python (which is therefore a dependency) which scans the directory tree if you want it to (hence no more messing with PATH). The script builds a personal version of the sublime package file which is configured for your machine setup.
At present broadcasting is not supported from Sublime Text but you can build and run from it with Ctrl+B. Autocompletion also includes the entire AGK2 Command Set.
It is Windows only, but if a Mac user is willing to collaborate it should be fairly easy to make it work on a Mac.
Freeware/Open Source
https://bitbucket.org/agkdev/sublime-text-plugin-for-agk2