The least they could do would be to close down the madrasses. I just don't have any faith in their ability to do it. Wouldn't have much faith in their ability to keep students out of the country either.
Even if they seriously wanted to crack down on extremist activity, I doubt they could go to far with it. Musharraf's actions in support of the war on terror have already caused a great deal of backlash from Pakistan's fundamentalists.
It's a tricky balance, getting as much cooperation without causing his government to be overthrown by fundamentalists.
The last thing we want, I presume, is a bunch of maniacs who are functionally equivalent to the Taliban taking control of Pakistan's nuclear arsenal.