Jim,
Yes, LDC1000 WEBENCH coil design tool only generates 4 mil geometries. You can only export a 4 mil coil currently. The data displayed is also for 4 mil coils. I don't think you can multiply the resulting data by 4/6 and assume its valid. Let me confirm this with the applications engineer and get back to you.
Regards,
Shrikrishna.