Users can now decide between recalculating and static ceilings in the Criteria section of the User Settings.
Recalculating is how ceilings worked before introducing this setting; as you adjust criteria (sections, rows, splits, increment, etc.), your ceiling will recalculate based on your Default Floor Price.
Static Ceilings will NOT recalculate the ceiling on a listing as the criteria is adjusted, allowing the user to change criteria without changing the ceiling.