The other forum I go on has gotten rid of a similar feature to Karma which used to be on here, and they've replaced that with a 'like' feature.. Basically instead of giving extra points to the poster or whatever, you just click Like on their post. A bit like on Facebook where you like groups and stuff. It's a good way to stop all the "This" posts.
Examples:
Am guessing it'd be able to be installed because the forum has pretty much all the same features as this one..