VRayDirt Map, work with transparency

[Klonsemann]

I remember (VRay3.2) that there was an option in the VRayDirt Map to work with transparency maps of other objects when generating the dirt.
Is this option completely removed, or is there any other way to do this in VRay5 (update2.3) ?

[hermit.crab]

The option was renamed to "Ignore invisible objects".