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Yeah. Rotational and linear inertia for NPC/mobs and players.
Yeah, I know, it's hard enough to do just plain old pathfinding with characters that act like nothing but 2D sprites in 2D space without any inertia but do give it a try just at least once. It would improve the game a great deal, yeah.
All this high minded talk about "innovation", and game characters still function like 2D sprites from a Commodore 64 game: they instantly rotate 180 degrees and turn on a dime even if they are gigantic monster bosses in WOW.