is it possible to get (mod. or plug.) like- "msg.karma" at this forum?
ATM there is no such plugin. We have it on our internal wishlist but it could take quite a while to arrive unless a lot of people request it.
To improve your chances, I suggest putting the request in uservoice (the red Feedback tab on the left). Then if many people vote for it, we will move it up the priority list :)