Adding references is quite a pain. There are just too many assemblies required to be added just to get the job done these days.

If the code editor detects that it doesn't know a type of namespace, it could easily do a background search (At least for assemblies in the GAC, those in the private/public assemblies folders and other paths that may be added. It can then suggest one or more assemblies, providing the path, version and other information that will be helpful in deciding when one(s) need to be added.

This would be a really big boon as well as a time saver.