Why is it stupid? You run into a wall or a spear or whatever causes you to rear, you shouldn't do that. You don't like the change because it means you now have to actually think about what you're doing?
I agree with the ctrl+j, it's a good trick and pretty funny if you manage to pull it off, but that alone doesn't offset the good the change does in my eyes.
Realistically speaking you shouldn't really be able to do much either, you're trying to regain control of the horse after smashing it against something. Though realism shouldn't probably be drawn into it too much.