The game is supposed to be unrealistic. Giving headshots adds realism imo, beside this I always hated UT since UT99 for this headshot thing. I was glad that I found a game that is different to UT as it is rather going like Quake1/2/3, having a instant hit railgun that is powerful.
I do agree that the nexgun is too strong atm, because it is powerful at close range and for sniping. But I think that upping reload time and reducing dmg to avoid spawnkills is a change that is powerful enough to have the weapon to be more "appropiate" compared to the other weapons.
and about this "remove zoom for other weapons": I still try to figure out how to zoom using middle mouse button and then fire with left mousebutton, when my forefinger can only press one of these buttons at the same time. Beside this zoom is nothing that makes sense for any weapon beside nexgun, because you only zoom when the enemy is far away:
Shotgun: makes no sense because it won't make any dmg on distance
MG: only weapon where it makes sense to use it because of alt fire
Crylink: see shotgun
Electro: lol, you're serious ? until the shot hits the target it already dodged the sht
mortar: totally unusable, you need the overview to know how high to aim in order to compensate gravity of the projectiles
RL: see electro
Hagar: see electro
so removing zoom isn't of any sense anyway