I think you misunderstand the Zone Read. It's not like Taylor can INTEND to give Roy/Rex the ball more often. The whole point of the play is that the QB reads a key player on the D Line - typically either the End or Tackle, depending on where the blocking scheme wants the play to go - and if that read shows keep, he has to keep the ball.
The problem Taylor is having is not in his intentions or his reads, it's in the way they're defending the play. Since SDSU our opponents have been loading the box on the Zone Read, committing the End to the RB and a CB and a Tackle (in the event our Center/Guard pulls) to Taylor. This means Taylor has a guy in his face immediately after keeping the ball, plus a guy on the second level waiting for his first move. At the same time the End is crashing down on the RB, with near-immediate contact.
It's a well-designed scheme against the Zone Read, but it leaves the defense vulnerable against the pass - as Oklahoma State discovered to their chagrin.
It was documented in some article (after the Texass game i believe) that people have been able to key in on martinez because he has been making the read before the ball is snapped based on alignment. So there are times that while it may look a read play, the "give" or "keep" is predetermined (by design). While this makes the play somewhat less effective, I understand why the coaches have him do this - it keeps the "bookwork" at a minimum for a freshman. Of course there are times when he makes the read in-play, but after watching zac lee run the zone read play this year, I would argue that he is actually better at making the proper read. The only problem he doesnt have the speed to pick up more than 6 or 7 yds, whereas T-mart can take it the distance. Just an observation.