OK....
I have just beaten the game yesterday.
1: Nice changes.
2: Ness already had his psychic powers, in the near end when Ness is in Magicant in his flashback
"Oh, he pointed his finger at his bottle and it moved a bit"
3: Nice things with Picky
4: Ness has PSI powers, not Kung-fu. Poo has Kung-fu powers.
Great, can't wait for Chapter 3.