Wouldn't add that much functionality honestly and I am kind of out of convenient buttons around WASD. Call it an official vote all you want but I doubt that the devs are going to add it with the current dev cba level and the potential for crouching to have some undesired side effects. You make it sound like it is a matter of flicking the 'crouch enable' switch, but it is not. It actually requires dev attention and this mod gets very little.