There's no need for that. The first question is why will I want to count the merit some one has sent in the last 120 days? So basically take it as it's not a very essential function hence it's not there. You can use any of the forum extensions and the good news is they do not only offer what you are asking but they also are fully open source.

Even if you don't want to embed an extension in your view you can use the tools separately there are a handful of them scattered across the forum. The 120 day history you see is just to show how actively you've been contributing in meaningful discussions.

There's no need for that. The first question is why will I want to count the merit some one has sent in the last 120 days? So basically take it as it's not a very essential function hence it's not there. You can use any of the forum extensions and the good news is they not only offer what you are asking but they also are fully open source.