Well since it seems that you don't have enough time to update it, I tried to achieve the automatic reward system.
But since I'm new with those kind of stuff (javascript, nodejs, nodeBB, mongoDB, et cetera) I don't know if what I did is correct, because I'm still thinking in terms of PHP and MySQL.

If someone wants to have a look this is my fork: https://github.com/TimP4w/nodebb-plugin-ns-awards
For now it "works" but of course it's not production ready.