Hello,
I've noticed that the load screens sometimes warn you that there is a cooldown on the Dragon Stone. It's not clear if this is supposed to be a cooldown timer on the teleportation function of the stone, or the dragon morph function, but I've not actually seen any cooldown on either (although, I've never really tried to use them immediately after re-use, but I've sometimes re-used them within like 10 seconds).
So, I'm wondering if that's one of the changes that was patched into DKS - removal of the cooldown timer?