If you are running gas shocks (not a standard item) you will have no problems and you will also have no problems with most oil shocks but like noss said, their life will be shortened.
Some shocks like monroe sensatracks have a 2 stage valveing and if you run them with super lows you wont have enough travel to get the second valve to work and you will onlu have the soft action of the shock.
You can als damage the shock by bottoming them out if you go too low. You might as well just use the stockers and when they wear out/are rooted, get something like some kyb gas struts or similar as they arent too expensive and do a pretty good job for the price