A few simple, general points:
- AC does count when it comes to hitting people at long range; try aiming at a person's eyes with a Laser Rifle at 45hex when he has Metal Armor mk2 onand then try it with Combat Armor mk2. You're going to be surprised. And yes, engagements at those ranges do happen.
- 95% eyeshots are not imbalanced, because they require high perception and exceptionally high weapon skill, forcing the player to sacrifice something to get it to this level.
- PvP is not about who shoots first, because most of the fighting is done in groups. What counts is numbers, surprise effect, communication and tactics. If you're trying to fight alone and are complaining that you die because the other guy surprised you and squeezed off the first shot, you are not adapting. Stop doing it wrong, start hunting in packs. FO PvP is not for "hardcore PKers", it's for people who can make the best out of teamplay.
Now, both of these ideas you mentioned before are terrible because they're going to:
- reduce the ammount of skillpoints one has to spend on weapon skill making every fighter an expert doctor or boosting his SPECIAL to some funny levels due to previously INT-tied points being spent on EN or AGI;
- reduce the importance of player actions (like flanking and using cover) in combat by making the luck decide - the roulette factor with instakill/stun/no-stun eye/head-shot critical hits is high enough, there's no real need to further aggravate the situation;
- make virtually every engagement indecisive; player characters can move really fast, so if a group is threatened from the flank or something like that most of them are going to be able to withdraw in a situation that would get them killed right now. I mean, I see it happening from time to time because of high HP these days - so halving the lethality of combat is going to make it ridiculous.
Moreover, I really dislike the fact that people who don't have a lot to do with PvP in this game try the hardest to change some random features. If you didn't take the time to understand and master the mechanics, why do you think your modifications are going to work? Somehow, I don't see any well known PvPers (either NA or DA) posting this stuff (or complaining too much about the game being imbalanced for that matter).