Let me keep this quite short. Drop placement. The player can select where they want to drop an item when holding a key (ex. TAB). To place the object, LMB must be pressed.
This can be any item they are holding, including weapons, food, throwables and special items. In addition to that, if the player holds the key on another player, they are able to give people stuff directly without dropping them on the ground.
From the inventory, simply holding shift or alt on the “drop” menu of an item will enter drop placement mode.
Drop placement, in addition to being an excellent way of handling items between players, can also be used to put stuff in place, like a battery into a radio, a car tire on to a car or a coin into a vending machine.
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If a player holds LMB, they can throw the item as if it were a throwable, which opens up an opportunity for creating distractions for Turned by throwing things like empty cans, or passing a medkit to your teammate from behind cover.