Likeability is subjective
Camera fix is needed
Stealth: yes NPC should respond better. But you should be able to choose which of characters join the fight from stealth and when. I wouldn't change that
Venders: I end up with so many health pots etc anyway...they restock after every long rest, when each character levels up as well. I expect there will be alot more in BG (ie in a city and not in a wilderness).
Different colours/ designs for equipment would be great.
Party size has been mentioned. 4 is fine with me.
More companions would be nice (in addition to karlach minsc jaheria). A small furry one would be nice.