Hey Scott,
I had a chat with Daniel, and he's open to IE6 support being added to the
polymer pointer events polyfill. There are some technical issues to
resolve, but if you're willing to collaborate on a single codebase (see
https://github.com/Polymer/toolkit-ui/blob/master/CONTRIBUTING.md) then we
think the value of working together will definitely outweigh the additional
complexity, etc.
We're starting to track improvements (eg. better spec compliance) that we
want to make to the polyfill in the github issues list here:
https://github.com/Polymer/PointerEvents/issues. But it's far enough along
already to be pretty useful in real-world scenarios. Feel free to file
bugs as you find things you'd like to see be improved.
Rick