This makes me really happy and I already dream about migrating an existing IP.Board forum (that relies on the group functionality) to Discourse 
Since I’ve posted the initial message I’ve been in contact with a few developers to try and implement this. But because we didn’t managed to agree on a price, licensing condition (i.e. what happens after the mod/plugin is ready) and/or timeframe, nothing was done.
I’m also willing to donate in order to have this done more quickly.