Have you played ArmA2's MP before? No one is gonna like to be limited on what they choose at a core level. It's literally best to leave that up to the mission makers, and in some cases it has been, and that's fine. Besides the nature of the game is so broken that anyone could level up quite easily just by doing CAS all the time. The very nature of the game is unable to support a mandatory leveling system.
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Stat tracking is fine, so long as it doesn't link to you not being able to have something.
no, no, no, no, no
This is not COD/BF/Kiddy shooter
We need an exorcist, now!
This guy is either a Troll, or never played Arma, or both :P
Seriously, a LvL system is not working with a Game like Arma. Its not (just) about kills.
I for example, often lead my mates in Coops and PvP - My "Score" is if we can bring a mission to end without casualties.