When MLG mode is enabled, if holding an item from a configurable list, vertical/all camera effects are disabled
Example scenarios:
MLG mode off - a player is falling from a lethal height, they have a water bucket to break their fall, but the vertical camera effect from falling moves their croshair up and makes it impossible to aim downward and place the water to break their fall

MLG mode on - The vertical/all camera effects are disabled when the water bucket is held, as it is in a list specified by the player, so the player can place the water to save themselves from a lethal fall

I'm sure there are other uses for this, such as when holding an ender pearl or ladder, to achive a similar goal which is why I think the list should be configurable (even if it's in a .json file)