Wind would be a nice thing to have but that will stress the engine even more (it should happen for every weapon then not just the sniper rifle).
Time of flight, is already in the game... Although ping got a bigger effect on having to aim ahead than the actual bullet travel time, but thats just because bullets fly pretty darned fast.
Bullet drop is already in the game :\ (but considering you fight pretty much under 100meter and lower most of the cases rifle bullets wont drop much smg bullets and pistol bullets do drop a lot)
Spotter, how would this class ever work in ro, especially at the ranges of ro if you spot someone he has probably moved before the sniper will see him too and shoot him, beside who wants to be a spotter, all the time. Its probably not worth
Vapor trails this is not really realistic as far as i know, and sniper rifles are just normal rifles so then all supersonic weapons should probably have it but in videos i have never seen any vapor trails of bullets. I know lots of games use it to make it easier to spot the sniper to balance the class, but on ro ranges a sniper is easy enough to find I personally don't want another "I'm Here" sign like the MG tracers are atm. Beside the sniper class is limited to overcome its strength over other classes.
Breathing enhancement, breathing is already in the game there just isn't a button bind to hold breath or something. At the start of going to iron sight there is hardly any sway this is to mimic focusing and holding your breath, later on you get a sway effect. Although a button to hold your breath and stabilize your sway for a small time would be nice.
Now something i personally would like for the sniper at least like in a tank the ability to change the range, because with the sniper you often have to put the cross hair over the target if you could change the range so the cross hair would move down then that would be of great help.
But most of these things are mainly things that might be nice for game2 by twi at the current time its probably not worth their time to do stuff like this
First of all, go
HERE and read up a bit.
Second, they weren't
called snipers. They were
called sharpshooters or designated marksmen.
Oh, and...
snip