Yes, that is me. I have the expertise, having maintained a fork of django-oauth2-provider for over a year; however, the issue with django-oauth-toolkit seems to be the lack of responsiveness on the part of the maintainers. We at edX are willing to contribute these features; but, we'd prefer not to maintain a long-term fork of the project.
I think the main reason for that is that its not a simple thing to do and there's just not enough expertise out there.