[sy_or_bust]

In this situation your hand is very strong, with great scooping chances. With shortstacked SB leading into you, it's fine to just call down, betting when checked to, with the plan to get all his money into the pot.

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assuming you know nothing else about your opponent, what is your up-front expectation of him given he's starting the hand with less than four BB?

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Not a strong player, or a smart one. Probably prone to getting 'all-in' with a large range postflop.

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Question 3 - given your answer to 1 and 2, would you play any different if the opponent was normally stacked (again assuming you have no other info on him)?

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Raise the flop. There's too much value to play for way ahead / way behind when you can extract more bets postflop. Those times you are 3-bet, you can call, planning to raise a made low on the turn/river, folding the river UI.