I have experimented to see if the bias is the case and it seems that after editing the vmt to say it is "LightmappedGeneric" it proceeds to import that material but none other. I want to know if you are aware of this bug involving that of discrimination from non "LightmappedGeneric" vmts.
EDIT: I have done this with all the vmts in the folder. Now the plugin creates a material for them.