My experience with 9.6c so far
About Unsatisfied Sex: Plan ahead if you want to unlock this scene, because if you "perform well" in bed and unlock a bunch of title which raise the base love level of the main girl above 50, you're basically lock out of the scene and need to use tool to unlock.
Trap Room: Only MC have scene, Chad have no scene.
Chad Room: The description said " For heroines who had their Rival 4b scene viewed or have done Prostitution 5 times" , so far for my test, it need both Prostitution and R4b to work, it mean for girl like Risa if you let her get stolen by Chad, the scene also will be locked.
Redone Chad's Night Sex: I test on both unlock the 4b Rival scene natural way or use cheat book, none of them work, I don't know if this mean you can peak at night or get a scene said "Chad have his way with xxx" when you sleep. Anyway, I didn't see any scene.
And bug, a lot of them, but fortunately none of them are game breaker for me so far (plus I backup my save frequently) .
Conclusion: There are no need to go for Chad NTR save file since he doesn't have a lot to offer (a lot of his scene can be unlock via cheat). You most likely miss Risa / Mala / Karen inn scene (which can be unlock and view by cheat), and the peek scene for R4b.You can just go for Vanila stuff, then prostitution the Heroine 5 times + Use cheat to unlock R4b to view the Chad Room / Hot Spring scene in dungeon. For Unsatisfied Sex you can unlock them natural if you plan ahead, or just use cheat, and at the end you also see the scene of "Chad have his way with xxx" .