Its a long shot but this site would probably get more popular if it included
PC gaming and other platforms and modding
It would be better if you Pm an administrator over this suggestion. There must be some reason there is no such section yet maybe.
That is OUTSTANDING advice, @Abdul_Rehman;.
But what has been proposed is not in line with the Sitepoint mission:
SitePoint is an online media company and information provider providing cutting-edge content for web professionals — developers, designers, programmers, freelancers and site owners.
Our aim is to be at the forefront of new ideas, emerging concepts, and state-of-the-art technology on the web. Whether it’s tutorials, books and ebooks, articles, learning packages, applications or specialist sites, if it’s anything to do with the web, you’ll find we’re covering it at SitePoint.
And I think there is no forum MORE POPULAR for the audience of “Web Professionals”.
We used to have one, but removed it because nothing was ever posted to it.
Since there are a lot of other forums dedicated to games, or even for a specific game, and don’t think having a gaming forum here would do us much good. Plus what @ParkinT; said of course.
In the meantime, you can always post in the General Discussions forum if you have a topic you want to discuss 
I think General Discussions category is suitable and enough for PC gaming topics. Though I like the idea of having a category dedicated to it (I play PC games during my free time, be it flash/html 5 or those hi-end types). Besides, I think this forum is focused (though not exclusively) on SEO and Web Development.