In my opinion, I think that when you crouch, it should actually lower your height. Think about it, in most games, and real life, when you crouch, you lower your body. The way I see it is that when you crouch, you should lower a half block or possibly a full block, allowing you to pass under what would normally be impossible (1.5 or 1 block height clearance). Feel free to post your thoughts and opinions on the subject.
I believe the main reason height is not lowered is unsneaking while sneaking into a 1.5 block high place or something. Further, this would also break many adventure maps which rely upon this.
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"We live only to discover beauty. All else is a form of waiting." - Kahlil Gibran
I am ninja'd far too often.