Those in my opinion will make the game little bit better
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Weather and time of day: will be nice to see few sets of weather, time of day, fog, dust etc for each map.
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COOP improvement: for now coop is very repetitive, because of the same bot spawns and same houses with checkpoints. Each map is pretty big village with lots of open houses/points of interest, many of them can be used as checkpoints. Random checkpoints, or at least few variations of checkpoint sets (similar to squad game) will increase replay ability. Also, randomizing bot spawns will keep the high tension.
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The character holds vertical grips in wrong way - thumb should hold the handguard. Holding the grip with thumb is unprofessional, and damages accuracy.
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Different car for security side - even if it's not hmmwv or other patented vehicle, just car that looks different than the insurgents' one