2. 3♠. This is intended to get partner to own to a ♠ stopper: he might have Jx x AQxxxxx KJx or the like and 5♦ is the limit. If he refuses to bid 3N, I sign off in 5♦. If he bids 3N, I bid 4♦ and now he absolutely has to show me the nature of his ♠ control: 4♠ with the Ace, 4N with the King and (probably) with the Qxx or QJx. Over 4♠ I will bid 7♦. Over 4N I will bid 5♦: a very strong slam move.
3. 5♣ in a long match, pass in a short match: I wrote my answers down before scanning the posts and I agree entirely with Frances and Jeffrey in terms of when to pass, but I like my hand too much to settle for 4♣ red at imps if I am going to pull. Sure, I may hate the outcome, especially if partner is 1=5=4=3 or so, but 4♣ is not getting me to 4♥ then anyway.
4. 4♠. I admit, this is an error. The correct bid is either the Bluhmer (I think that is the correct term) of 4♦ showing almost exactly this hand or 3♦ as a non-committal force. However, I did not think of either until I had written down my actual bid

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