Just an idea
Have 3 weapon slots
1. Primary (assault rifle, sniper, smg, pistol, launcher etc)
2. Secondary (assault rifle, sniper, smg, pistol, launcher etc)
3. Melee (sword, knife,( or maybe items like binoculars credit: BlessedSeraph))
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2 weapon slots will make you think twice before going into battle, thus making this game (for me) more interesting. Also, I don't know what they're feeding those kids in the future, but going into battle with a sniper rifle, shotgun, assault rifle and pistol is maybe a little too enthusiastic..