I am a fan of Taylor running, however as others have said, we need to have complete confidence in our backups. Not having a spring game this year obviously doesn't give fans a chance to see Carnes or anyone else in action.
Given that his footwork and passing mechanics must be at least a little better, the development of our RB stable, and an increased balance (more passing) on O, hopefully he won't have to run as much. Obviously his straight-away speed is his biggest running strength. He only makes guys miss by running right by them. However, get a good angle on him or stack the box and he's history. SDSU figured that one out in 2010.
Seeing Scott Frost lay guys out was nice, but I don't really want our QB giving defenders the business. That's not his job, no matter how good or capable our backups are. Sliding is just fine with me provided he slides at the right time and not too early. Anything to limit fumbles and move the ball forward.