But not over the middle...
While I do agree poudning the strike zone is something he needs to work on, it's not as simple as just getting the ball over. We saw what happened to him against Tampa earlier this year when he simply just "throws strikes". While Daisuke does nibble, simply throwing the ball over against a major league lineup - even the Orioles - can lead to bad results. Pitching is all about painting the corners.
One thing I've noticed abotu Daisuke is when he uses his fastball a lot more to paint the corners he ends up doing a better job. Too many offspeed ptiches he tries to paint the black and when unsuccessful he gets into some real bad counts. If he can pound the corners with his fastball, it makes his other pitches that much more effective.