I would think the point would be to teach any new puppy, that there is no type of biting or nipping that is ok. Hard or Soft should not matter, "to me" nipping or biting is just not ok! I also do not think that jumping up on a person is acceptable. I have seen Roo exhibit some of the jumping up behavior also. What we do with him at that point is to direct him to sit or completely ignore him. Once he is calm, then we call him to us, we do not go to him.
In our opinion, socialization of a puppy while influenced by his litter mates, is also accomplished by exposing a puppy to many other dogs, and people. The way we accomplish this is by taking Roo on walks in the park that other dogs share, many trips to pet smart, interaction with our Boston Terrier, and exposing him to smells, sight, and sounds of the different farm animals that exist in our area, as well as exposure to all the same things in the larger city that is close to us.
To teach him to come to us both, we used a flexi leash in the park, and Cherrios for treats. He has to sit before he gets a Cherrio. We also do not allow him a treat every time he performs well for us because we want him to learn to obey without expecting them. Even my Boston Terrier likes Cherrios. Both Dogs have to sit after the walk and wait their turn for a treat. Cherrio's are very cheap, and a good training treat.
If Roo has been esp good for us for an extended time, then we give him a bully stick which he seems to love.
By the way the weather has been in the 60's and 70's here. Those temps are perfectly safe for a dog crated in a car with the windows cracked. Please keep in mind We are in the Mid West.
I also purchased a fan I found at pet smart that mounts on the front of the crate, that is designed to move Air. It will run 100 hours on 2 D batteries on the low speed. I would recommend this product to anyone. Also I am investigating the crate pads that contain crystals as well as the bandana's that are supposed to help keep dogs cool in the summer.
I always carry bottled water, food,treats, leashes, a towel, and bowls in my vehicles. Since you never know what can happen(Cars do break down), I always find it good to be prepared.
Jason