1. What do you mean by objective vs. subjective? Depending on the meanings, my view of morality is both subjective and objective. Subjective in the sense that it utilizes the subjective preferences of individuals and objective in the sense that their are objectively correct answers to moral problems. When I say that morality is objective, I mean that some people can be incorrect in their analysis of moral claims. If they believe different from me, then either I am or they are wrong. It doesn't matter if they believe different than me, just whether or not they are correct, but their case has yet to be demonstrated and an error has yet to be pointed out in mine.
2. Used the second definition. It is unwarranted, as in, it lacks moral justification.
3. Your use of the word "wrong" is questionable. I already mentioned that it may be a meaningless term without a further structure. Right and wrong are just shorthand expressions, they are meaningless without the thing that they reference to. Like in the chess example, answering "is this a good move?/should I move here?" is dependent upon a certain framework; a framework that includes the rules of chess, the desire to win, etc. Saying "that is a good move/yes, you should" is meaningless without reference to the above framework.
Similarly, we have some givens and constrictions in the morality framework, we all have certain desires that are shared with each other (pain avoidance) and some that aren't (hobbies), the restrictions of the physical world, etc. In this framework, there are objectively correct and wrong answers. When you use the terms " right and wrong" outside of any such framework, it is meaningless, but that is not how I use the term.
An action is only acceptable as long as the person receiving the action allows it to be so.
This isn't so clear to me. What does it mean to allow it to be so? Does a prisoner allow it to be so to be imprisoned? If that is the case, then it is also correct to imprison innocent people because they allow it to be so. Or do you mean it as in they don't object to it? If so, then prisoners would not allow it to be so, in which case it is not correct to imprison guilty people. Either it is morally incorrect to imprison guilty people, or it is morally correct to imprison innocent people. One or the other has to be correct by the given criteria. Unless you think this to be the case, I won't waste any more time continuing from this faulty criteria. You also seem to be conflating descriptive morality and normative morality. I'm referring to normative morality, not descriptive.