Enhancement: Masks for LightMappedGeneric parameters

[HugoBDesigner]

What would this enhancement be for?

Rendering

Describe your enhancement suggestion in more detail

It is currently not possible to have a LightMappedGeneric material use different alpha-based parameters simultaneously, like both $selfillum and $translucent. Not only should these be supported simultaneously (like they already are with VertexLitGeneric), but there should be a way to define an external alpha mask for $translucent and $alphatest (the same way $selfillum has an complimentary optional $selfillummask parameter).