Hello and welcome to the forum,
In terms of hyperactivity, this is the subject of much debate and there doesn't seem to be a definitive answer. personally I found that my dog did seem more settled on a raw diet but I am inclined to think it was timing and she was starting to mature and settle in. She was a rescue and a stray and she needed lots of time and patience. The raw diet certainly didn't increase any anxious behaviours anyway so that is good news. Again, it is hard to say if this will be true for all dogs.
I can't help with your second query I am afraid, as my dog has yet to leave a single morsel in her dish. I mainly feed nutriment and get a mixer box so there are plenty of varieties. I sometimes just get a box of the low purine and she is happy to eat that until it runs out. Bear in mind, she is also happy to eat socks! Again I think the answer will very much depend on the individual dog.
As for treats, I will give non raw food treats. Some people are quite strict about not doing so. It can be a concern that by mixing different types of food, they may digest at different rates causing problems but since I don't feed treats and meals together, I don't worry too much. I also sometimes mix cold pressed food in with the raw but the manufacturers say that it is safe to do so. I do tend to give this for treats as well to be honest.