Give them sniper for that round if their score gets above let's say... 50.
Where did that come from? I hate scoring systems where the better you do, the more advantages you get. It means someone just has to be a little faster in the beginning, then they get slightly better weapons faster and kind of accelerate from there, but by the time they get to a weapon they're satisfied with (I would say the sniper is something anyone would be satisfied with, since it's basically the most powerful weapon around), they often just start killing the noobs. Can't you see a bunch of cops getting to 50, then all camping at armor?
Also, why give the cops a sniper? They already have M4s, which are far better than anything terrorists have from a distance. I have a feeling that you play as a cop a lot.
Only securities are tend to stay with President not the cops. Thats why they can play unlike securities. So comparing security's scoring system with cops will not be appropriate. But cops can earn scores by acting like a barrier for terrors which means whenever terrorists will be stopped by cops in reaching to the president, they will get score but cops will have to do it in a decided perimeter around the president.
I've always played security in a way where I stop someone from getting near the president by disabling their vehicle or taking their health down so far that they have to get armor, but not going farther than that if it involves being more than a few seconds away from the President. If I feel that me being near the President is really important, I'll often just ram people away before they get to him instead of slowing down to deal with them.
If I'm a cop, I follow the President more loosely, and when I prevent someone from getting closer, I usually try to kill them even if it involves chasing away from the President for a bit. I will often break off even when I can kill someone as a security because I want to preserve my vehicle to stay with the President, but as a cop, I am okay with destroying it to kill someone.
This, for me, is the difference- what the goal of the class is. For security, it's just to get terrorists away from the President by either killing them or crippling their vehicle or health as quickly as possible and without being far from the President. Cops, meanwhile, should try to stop people from getting to the security layer at all, and finish off the crippled players the security leave.
TL;DR:I think cops should get more points for stopping someone who is heading for the security layer, slightly less points for stopping someone already in the security layer, but as many points as the security get for stopping someone who is actively harming the President or security. That way, they are still motivated to come directly to the President's aid if they see something which is particularly hard to stop and dangerous to the President, like a car of terrorists with combat shotguns.
I also think that the perimeter of each layer should vary based on how long it takes to get to the President by whatever mode of transit the player is using. The security perimeter should be maybe 10 seconds away, while the cop perimeter should be 20-30 seconds or something. So the perimeter would be much smaller for someone on foot, larger for someone in or surfing on a vehicle (maybe depending on the speed, so if you have an NRG, you have a larger perimeter than if you're driving a slow vehicle), and largest if flying (but hopefully also based on speed as well, since a Hydra can cover way more ground in 10-30 seconds than a stuntplane).
If it isn't computationally prohibitive, it would also be nice to have a command to approximate the perimeters for all classes with transparent gang zones on the map (maybe allow adjustment of color, thickness, and transparency of the markings), even if the approximation is only lines on the X and Y axes coming from the President's position, like crosshairs:
The radar if you're a protector (I'm only using square blips because I'm lazy). Since the perimeter is circular, you have to imagine the four lines being radii of a circle. The cops are in their blue areas, although one is in the security area because of the dark red blip (lots of terrorists in one car). The security are all in their green area. The size of the areas would change based on what you're driving or if you're on foot, so assuming all the protecting blips are in vehicles that have the same speed, they are in their proper perimeters, but you aren't. Let's say that everyone is driving Ranchers.
Same situation, except now you're in a Hydra. The other players are still in their Ranchers, so they still have the perimeter in the first picture. Since you're in a Hydra, which let's say goes twice as fast, your perimeter is twice the size, so you are in fact within at least the police perimeter, and probably the security perimeter too.
The radar if you're a terrorist. I don't know what the perimeter would be based on for them, but it should be affected by the terrorist's vehicle and maybe take the President's into account too.