I am 5 weeks post-op, and I also agree that many of the cravings go away. Through the liquid diet period you get used to people eating "fun stuff" around you and not being able to. If a craving for a specific item turns up, you can have a bite - you probably won't be able to eat more than that anyway and if you do you will likely regret it.
With that said, you still have to know and accept that there are limits to what you can eat. If you aren't mindful of that you will stretch your pouch back out and balloon right back up. If you think you really have a food-addiction you might want to get that sorted out first. Having the surgery and not following the diet seems pretty pointless. In my case, I think I do have a food addiction. I sometimes convince myself its okay to cheat. I have to really keep that in check if I want this surgery to work. But having a small pouch makes it easier.
I think that even if you can't do full on exercises now, some weight will still come off from the calorie intake, just not as much. When you slim down a little, maybe your knees will be more cooperative!