I've spent some time thinking about the problem. In an ideal world a standardized protocol to push changes to a server would be awesome. I think it's unrealistic though to expect widespread adoption especially for existing frameworks to add code just for doing this. For example, have you ever heard of WebDAV? It was thought up along the same lines and it's virtually dead now.
A better solution for now would be for source maps to tell you the full local path to the original source file. Yes, in a world where we all develop from Chromebook-like devices against files in the cloud, this won't work. We are a long way from that world at the moment.
* It doesn't support re-compiling Sass, LESS, CoffeeScript, etc. on a file change.
I'm actively working on fixing both problems.