First off, i just want to say i don't remember if this was a thing.
Why i should think it should be a thing: it would add a bit more forum engagement, now i know this is stupid, especially for a fighting ragdoll game forum. But hear me out, if there was/will be a reputation system on the forums it would allow users to "rate" members for their post, such as like/dislike threads users post, allowing them to have like a rating on the "postbit" (the thing on the left side with avatar, etc.) that can be negative depending on the ratings the user gets. Such as if the user has above a certain number of good ratings/reputation the number on the postbit turns green, if it goes negative it turns red.
Why would this be useful? Simply for forum engagement. Maybe help lesser known threads to the top depending on the ratings on that thread? Now this could be "unfair" but it allows users to vote on threads they like to be raised to the top of the forums, maybe restrict reputation to certain forums as well. As well as you could only allow users to vote on threads that arent theirs, only vote on a thread once, so on and so fourth.