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A couple of things for the original poster. Don't warm up your car in the drive way. They don't get proper airflow, and don't like it. Do start the car, let the oil pressure build up for 20 or 30 seconds and then drive gently, at 1/4 throttle or so until warm.
When warm, you can extend the car, and drive it as you like. It is my opinion that running a cold engine hard can be bad for it, and could shorten the life of the valve guides. Cold oil does not like to flow into the small clearances where it is needed, but will go shooting through the large passages.
Use the right oil. An oil with anti wear additives. ZDDP will protect your cams, and prevent costly rebuilds.
Buy two books. The Used 911 Story, by Peter Zimmerman, and 101 projects for your 911 by Wayne Dempsey. Read them.
It is OK to drive your car. They like to be run, and seem happy being driven.
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