@Matthew_White
There doesn't seem to have been much further activity on the document - have you had any further discussions on this topic?
The Add Users endpoint which we suggested is becoming more and more necessary for our deployment.
Would you be interested in setting up a Skype call or some other form of discussion to try move this forward?
Similarly to @Kate_Chapman and @Mark_Schormann (who commented on the referenced thread), we'd be happy to help with some code contribution but aren't able to lead the effort.