This is one of those things that suffer due to an outdated and horribly inadequate front page. The index is dated as well. I will have a look and give this some thought nonetheless.
A quick fix for the index is simply to list the games as subforum.
Total War GamesToB
WH I & II
Attila
Rome II
Shogun II
NTW
ETW
Medieval II
Eras
MultiplayerHost seats
Roe-Playing
Non-Total War ContentNon-Total War Games
Debate and Discussion (I would move the sports forum into this areas as well)
Personal Help (shouldn't have)
Traveler's Lodge
The Basement
TD
This would be a pretty quick fix.
Note: Depending on how fast these Saga games come out, you may subdivide further. Historical Titles/Saga/ Fictional (if they were to go beyond Warhammer). My guess is in Fall 2 Kingdoms comes out and the following Spring (2019) they will come out with another Saga. I do not expect a hardly any DLC's come out of these small sandbox games.