I don't think the Rogue is THAT hurting for damage. If you can reliably pull of sneak most every turn, you'll be doing decent damage. I know that's easier said than done but some(Swashbucklers) can do it better than others.
I can agree that there could be SOME sort of feat support for those who wish to make a DPR focused Rogue. Sentinel is a poor choice because a Rogue doesn't want to end it's turn standing beside an enemy.
If anything, the biggest problem with the Rogue class is, it's actually kind of difficult to play properly(in combat) compared to most classes. Rogues are meant to hit, run, and hide. Cunning Action and Evasion are really strong features. Uncanny Dodge is good, but it's only once per turn so getting hit by multiple enemies can be bad. I'd rather have Defensive Duelist since turning a hit into miss is better than turning a hit into half damage, but hey, it's free.
So yeah I'd be on board with a feat or two that boosts the Rogue's DPR whether it be giving the Rogue a 2nd attack, allowing a 2nd Sneak attack per turn, giving it more d6s, turning the d6s into d8s, or taking away some d6s but making it more reliable.