I wouldn't worry about the fumbles at all. He's never shown a tendency to be a fumbler before. He just had a bad game in that regard.
I'm not too concerned with TD passes or even INTs. As long as he doesn't throw more than 1 INT per game on average, I can live with it. TD passes can be misleading. More is always better, less isn't always bad. Troy Aikman had only one season with 20+ TD passes. You have to take the overall performance of the offense into account as well. I also think that the often ignored stats of yards per attempt and completion are very important. If JP is averaging 7.0+ yards per attempt and 12.0+ per completion, he's probably doing something right, regardless of what the TD/INT ratio says. He was close on the latter last year, but has some work to do on the former.