Your comments

Yeah, it would be good to be able to utilize these vars in snippets as well. Actually, I think that worked in 1.x.
No, I don't want access to the keybindings stack really, as powerful as that may be. I just want a plugin/package to be able to have it's <package>.sublime-keymap picked up just like it worked in 1.x.

I had read a comment a while back that Jon was planning of customization of binding loading rather than just alphabetically based on the package name, since that was a poor solution. Maybe the port of package bindings is waiting on that new fandangled magic to be fleshed out.