“The reason the additional parsha which earned ‘Yeser’ his name begins with Yisro’s proposal for a solution (rather than his recognition of the problem) is because criticism is never an addition. Anyone can criticize. Anyone can come along and say ‘That is not a good idea.’ ‘What you are doing does not work….

The addition, the ‘Yeser,’ is when you give a creative idea of what should be done to solve the problem. That is why Rashi says the passage that Yisro added for which he was given an added name was the passage beginning with his solution…”