[Al Skierkiewicz]

There are a couple of things that teams can do to use a standard 270 degree pot without breaking it. You can easily use a couple of nylon gears (from Small Parts) to couple the pot to your steering mechanism. You can mechanically limit the travel of your crab so that you stop turning before the pot is broken or you can spend some money and buy a continuous pot.
But dpick, as you can see, no one is telling you to do crab without a pot. There is no way for the robot or the driver to know that the crab system has actually gone where the driver has told it to go or for the software to get it back to driving forward.