How does this Pasuk fit into Moshe's rebuke of Yisrael?
Rashi: From the fact that they readily agreed with Moshe's suggestion and did not reply that it is preferable to learn from the Rebbe - Moshe 1 , than from the Talmidim, Moshe understood that they liked the idea of more judges, who would be easier to bribe than himself.
Rashi: Who had initially toiled over the Torah. R' C.Z. Fogel
Why did Moshe add the word "La'asos"?
Rashi: With reference to Yisrael pushing him to get on with it, whenever they felt that he was lax with regard to appointment of the judges.