Sorry OP, I have come to this post very late, so have not seen many of the other's posts, but I have read all of yours, which show that you have had a very mixed bag of responses (no surprise there of course). Here is my twopenny worth!
OMG OP, why are you posting here? You are coming across as an amazing Mum, who has her head both screwed on very tightly, and in just the right way. But I am heartbroken for you, not because of your little boy, he sounds delightful, and your descriptions of him make me grin, and even laugh. I have 3 adult boys, and you have brought back so many lovely memories. My sadness is for you and your childhood, I have a few good memories from my childhood (my parents were good people, my mum was the best, but my dad's moods ruined many of what should have been happy events - he only hit me once, when I was 14 he slapped me around the face, I think I had been unusually cheeky to him), that you also cannot look back at a childhood full of joy, every child deserves a joyful childhood.
I do not, and cannot, believe that any child who lives with joy can grow up to be anything but a kind and loving person. Luckily, many children who don't have a particularly happy childhood, still manage to become lovely well adjusted adults, but how much better is it to be able to look back on that childhood with many happy memories. I am reasonably sure that my Dad had some well hidden - from most - mental health problems, but when in company he hid them well. My Mum, was a loving, caring Mum (although I do not remember her being particularly demonstrative with lots of hugs and I love you's), who should have left my Dad when I was a child, not in my 20's, but I guess she was scared of bringing up 2 children on her own. I wonder why as an adult I never asked her. Anyway, this is not supposed to be about me, but I wanted you to know that I think I understand where you are coming from, and I had many of the same feelings as you about child rearing, when mine were young. I couldn't give my children the childhood I wanted to, mainly due to my own insecurities, very sadly I don't think any of them look back on a happy childhood either. It was very different issues that affected them, I know they have always known how very loved they are by me, but their Dad walked out when the youngest was a new born, however he did continue to see them very regularly, and pay child maintenance for them. I tried not to slag him off to them, or anyone really, my psychiatrist told me I had to hate him, but I couldn't, I loved him enough to want him to be happy (he openly left me for a slightly younger woman, I was very young when we married), I think he left because on one side I was too emotional for him, and on the other not academically (or even culturally) educated enough for him. He is extremely academically intelligent, but not so good on emotional feelings, or have much common sense.
You on the other hand sound very in tune with your emotions, and what you want to achieve in life, well at least as far as your child (hopefully children - as you expressed the want for more children) is concerned. My feelings were, and are still, the same as the ones you have expressed here in regards to child rearing. I really cannot see anything "wrong" in the way you treat your gorgeous boy, it sounds like you have exactly the right relaxed attitude to his behaviour, whilst still punishing and rewarding him at the correct times. You won't always get it right, but it sounds like you will much more often than you get it "wrong". I believe that it is actually good not to be perfect, what child or partner could live up to the perfect parent's standard, in fact the very act of being perfect would surely make someone imperfect? I stronly believe in apologizing to anyone you have wronged, even children - maybe especially children. Your son really does sound delightful, loving and kind, learning empathy, yet with the spirit to push the boundaries. I firmly believe that between the ages of 12 months to about 18/20 years old, all children should push and question boundries, but for safety's sake always know when No really does mean No, and to stop immediately, and ask questions later. If you always explain afterwards the need for the negative reply, they should quickly learn to trust your No's, but you already know all this I am sure.
My eldest son's nursey told me he was being a bit destructive, when he was older he got a long way to becoming a policeman, but whilst training found that he couldn't take the inherent racism, and lack of general empathy for others - I am in no way saying that even most police officers are like that, just that my son could not cope with how many there were. One of my other 2 sons has a job in the care sector, and the third is currently unemployed but volunteers at a charity. By the way, although all loving and caring, in someways they have very different characters, the first was very out going, the middle about usual, and the third not so much, so any more children you have might be quite different to your ptesent little boy.
If you are still reading this book (!), you come across as very aware of what you want for your children, and I want you to stick to what knowledge and instincts you have, because to me they are spot on. My one actual suggestion is that if you are not already, you and your partner need to be as much as possible on the same page when it comes to their upbringing, my ex believed in smacking, I didn't let him, I could never have let him, even if that is why he left me - maybe he felt emasculated?
You are inspirational, but you must never be perfect!