The thing is that some of the stuff you want already exist in the game but on certain maps / progression points. So, it's spotty I guess. You should try to play around that fact, but having more options to mess with Raiders other than flat out killing them would be nice.
The buff I'm on the fence. In the early days I would agree with you but now since I'm closing in on level 140, with my knowledge, passive points, and weapons, not so much. I've been able to consistently win against high level players the higher level I got. Maybe give lower level players a boost but honestly it's something you learn to overcome and will with more levels. Im 132, and I've beaten teams of 200+ from overpowering them, to outsmarting them in melee, to screwing with them (even when they were constantly killing me) to run out timers.
Honestly, Antag is only possible to those who really, really, really know this game. You know everything about every map, you know the raiders and typical strategies they do, and you fully, FULLY, understand the stress, melee, and movement system. And you have to be a sneaky asshole or an aggressive asshole. I've played against some good and bad antags, and the bad ones play so horribly that they would get destroyed on any 3rd person game. Good Antags take advantage of weak positioning, bad coverage, Rambo players who don't have the skills to consistently win 1v1s, Mob spawns. Antag victories are earned, you don't have a lvl 300 trying to power rush the objective while you stand still, shoot, miss every shot, and do nothing. Honestly, they should stay that way.