Small follow up on this, but this is now possible with the Discourse Gamification plugin, including adding/subtracting points using the API - How to integrate Discourse Gamification with an external system (redeem and award points) 
Small follow up on this, but this is now possible with the Discourse Gamification plugin, including adding/subtracting points using the API - How to integrate Discourse Gamification with an external system (redeem and award points)