Adding Quests to a game requires time on both the game developer's end and our staff, so not every game is going to have Quests. And since this is brand new for us, it will take a bit to get the process fleshed out and smoothly moving -- but we'll get there. - Boppins
Judging from that post, it's possible if those developers are still active. You can always recommend games here and they'll see what they can do. But yes, I'd like to see older games with quests. For example, Exit Path. Made in 2010 and was very popular, but now it's not, quests could bring back some popularity.