Well ime It would have nothing to make coral grow faster. It will have more holes to put the plugs in if you arent gonna take them off. But again you can not have anything living in the tank like fish corals or anything like that or the rock would kill it. The rock will release ammonia and that will kill all your fish then theres nitrate nitrite tons of other stuff. So i would first start completely fresh if you want to have dry rock.
The_Fish_Man otherwise known as Scooby
"Each tank is a different world....... Bored of yours go into your fishes":p