For the knocking plates off of the counters:
Try putting tape around the edges of the counters, sticky side up.
Also, you have to remember, if he's knocking them off, he's in reach of them. Try to avoid the situation by putting them out of his reach.

What do you mean gettings his treats himself?

I don't think he'd be marking inside just because a smell of the neighbours dogs. (I could be wrong)

I suggest taking him outside more often and not coming in until he pees. How often is he peeing? Is it always in the same spot, or all over?

Why is it too hard to pick up the poo when it's soft? Use a spade and scoop from the edges rather than the front point. Or use a bag. It's not that difficult! Unless his poo is watery, (sorry, gross, I know) I don't see the trouble! lol

Make the time in your day to go outside with him when he needs out. Imagine how hard it would be if he had to let you out everytime you needed to go but he wouldn't let you out because he didn't have time.

You have to adjust to your dogs needs.