bUseExternalClickDragBehavior

If true, then the [URectangleMarqueeMechanic](API\Plugins\ModelingComponents\Mechanics\URectangleMarqueeMechanic) will not create an internal [UClickDragInputBehavior](API\Runtime\InteractiveToolsFramework\BaseBehaviors\UClickDragInputBehavior) in [Setup()](API\Plugins\OptimusCore\EOptimusNodeGraphType), allowing the client to control the marquee with an external InputBehavior that uses the marquee mechanic as it's [IClickDragBehaviorTarget](API\Runtime\InteractiveToolsFramework\BaseBehaviors\IClickDragBehaviorTarget).