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It would allow me to specify whether or not I wanted to try and dodge your hug. If I thought you were going to crush my ribcage, for example, then I wouldn't want to just stand there. But equally, I wouldn't necessarily want to dodge a hug from a friend.
Far too slow - it would render the offensive hug useless, as I could just walk away as soon as I saw you trying to hug me.
I could see the acceptance working for something like a handshake (you offer them your hand, which they can then choose to accept), as it requires an active response from the target. But something like a hug, kiss, or a pat on the back should automatically succeed unless the target responds defensively. And in those cases you really need to define your desired response in advance.
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