you know, it might actually be that he literally feels like he has to pee that often. part of potty training is being able to hold it longer, and most kids, especially boys, cant really do that until 3 or later. we as a society "expect" kids to start or finish around 2.. and thats simply not fair for their physical readiness. :) but like you said, you didnt expect it until 3. LOL.
i cant tell you what you should do. im thinking that he cant hold it that long when hes awake, hes feeling the sensation, and he feels he has to go, and he has to go now, even if its just a dribble. so i dont think hes manipulating you, but im sure he enjoys the big deal you are making about it. :P maybe lighten it up a bit? still congratulate him, but just maybe a little less so?
one thing about parenting you have to make the rules, and you have to stick with them. if you break them once, your kid is gonna think you will break them again. so you have to really stick to your word, no matter what. just start trying to do that and see if it helps with the other things.