A new reuse option for connectors in conditional import is typically used when, for example, message flows are connected to an element inside a pool and the condition of the pool is not true.
With the new sub-options it is possible to hide the lower level connectors that are not connected to a from/to element, or to hide all the levels where the connector is visible and not connected to a from/to element. See the "DropOutsideConnector" option in the Developers Guide for details.