A burning globe of fire rolls in whichever direction you point and burns those it strikes. It moves 30 feet per round. As part of this movement, it can ascend or jump up to 30 feet to strike a target. If it enters a space with a creature, it stops moving for the round and deals 3d6 points of fire damage to that creature, though a successful Reflex save negates that damage. A flaming sphere rolls over barriers less than 4 feet tall. It ignites flammable substances it touches and illuminates the same area as a torch would.
The sphere moves as long as you actively direct it (a move action for you); otherwise, it merely stays at rest and burns. It can be extinguished by any means that would put out a normal fire of its size.
So what happens if the caster won't or can't use a move action to attack with the sphere, does it deal damage for a fire of its size to creatures in it's square (assuming they are prone or small enough to legally share the square)? I know it doesn't specify that it does damage in this case, but a normal fire of its size would, which is where this question arises.
There's a related question, but I don't feel it fully answers this specific instance (and is contradicted a little by the first question's answer).