Is there anything you can't do when lucid?

For example, running super fast. Would your legs look like roadrunner's legs when he darts off, or would it just be normal leg movement but you would be moving uncommonly fast?

What happens when you die in your dream while lucid?

Can you turn yourself something with a non-humanoid form, i.e., a piano?

Can you speed up/slow down dream time?

Can you get sleepy/tired?

Can you create a sense (in addition to taste, touch, smell, hearing, and sight)?

Could you clone yourself, and BE each one, having different thoughts, perceiving different senses, and doing different things?

Could you study for exams even though you haven't memorized the textbooks or your old tests?

Most importantly, if you had an experiment (while still awake) to hook 2 people up to electrodes or whatever and transmit their thoughts and brainwaves to each other, and if they both became lucid, could they meet each other ? If so/not so, would they have actually SEEN what the other person did in that OTHER PERSON'S dream? (like in a first-person shooter game in 2-player mode, when you see what each other does from your own perspective)
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These are serious questions...please treat them as such.