The more I think about this, the more I like it. I badly want my vim to be multi-threaded and a separate engine, especially one that had a queue based pub/sub type interface could really open up some cool possibilities. At that point if you could give it the ability to use operational transform for the changes it would make remote editing, as well as remote pairing work really well. I know floobits is doing something similar but I would have to think this would make that much easier to pull off.
