There is nothing unethical if misdefense can give you more tricks. After all, every player is trying to reduce his own mistakes while takes the advantage of opponent's mistakes. That is how one wins.
Q1. pass, though I might consider 3H. Q2. dbl or 3N. I prefer 3N, because I would not be happy if pd bids 4H over my dbl with 4Hs or even 5 (as the real holding).
A dead minimum hand, with half stopper (only) AND not good support for pd's suit, I would never freely bid 1NT, which I think is completely out of the question. I voted for "highly aggressive"