In Joint Operations mode only; every hour you get a task to shoot an enemy PMC first and get the "First Strike" on them, shooting an enemy PMC before they shoot you gets you a small $200~ incentive. To make sure people don't harass other players after the intended "First Strike"; simply force guns into "Low Ready" position when firing on a PMC when you DO NOT have the "First Strike" task available (If you never take the task you're completely unaffected).
There might be a minor consequence of getting shot a bit more often but I think most people won't mind and it adds a (revolutionary and super brilliant that deserves praise in an HONEST NON-FALLEN WORLD {uwu}) PvP minigame detached from the inevitable griefing cheaters of regular PvP servers.
{INB4 DOWNVOTE BOTNET AT LEAST USE YOUR WORDS AND TELL ME WHY YOU HATE THIS IDEA! THANK YOU!}