The Lafollette presidency 1905 - 1913, would have meant more progressive reforms than OTL.
Possibly. LaFollette often followed the rule that "Half a loaf is worse than nothing if it fills the public's appetite." He would often veto legislation if it did not go as far as he intended (although he could back down on occasion. His railroad refoem legislation was actually weaker than in many other states, as he was anxious to pass it and take his position in the Senate.). In fact, this tendency is what caused his break with TR, who he viewed as a weak willed appeaser(!!!!)
My own suspicion is that LaFollette would get less legislation passed, but the stuff that did pass would be of more substance. He also would have no problem using the bully pulpit, and would likely adopt a tactic he used in Wisconsin; traveling to the districts of troublesome congressmen and agitating against them by reading their votes to the citizens. That alone would be interesting.