Your comments

@telephono in case you haven't found this yet, I created a gist which helps with setting syntax highlighting using a Python script, it also supports files without extensions:
My advice: make a GH-Pages page at, and make it a public repo on GitHub. This way, we can all add small changes and additions to the documentation, which removes some of the burden to you, the developer of ST2.
How could we do this if we have, f.e. the .rb extension which is used for all ruby files, but I want files ending with _spec.rb to use the Rspec syntax?

I tried using the following in rspec.sublime-settings but it doesn't work: