It wouldn't be as simple as just making the shifter handle longer, there's a flexible rod inside that the push-button uses to take it out of Park, etc. so making the handle longer would take some work/fabrication. You could move the whole shifter back a few inches however which would also require you move the console back the same distance.
By the way, you can easily and quickly (takes maybe 5 minutes) stop your tires from rubbing when the steering wheel is turned all the way for just the cost of two cheap washers. Here's how... http://www.4x4xplor.com/steerstop.html