Now im pretty new to this game so idk if this stuff has been suggested already or not but id like to throw the ideas out there.
Medic class:
A guy running around dropping health packs/healing people would be a fun class to play. They should get maybe a pistol or a really weak gun to keep it from being over powered.
Enable running up blocks:
You are able to walk up them why not run?
Fog:
Id like the fog decreased but this could cause problems, With the one hit kill headshots on the rifle, without as much fog in the game that rifle would be overpowered. If you lower the fog and make a more 'obstructing' sight on the rifle it would help. Like make it harder to aim in with the rifle is what im trying to say. Only do that if the fog is being changed.
In game chat:
Being able to talk to your team would be an AWESOME thing. You can organize and shout out where people are and what not. There should also be a mute option on the tab menu for them pesky 8 year olds that scream into the mic.
Hope this helps the game in the future