TrapInc

This is the post I read but I knew it wasn't exactly what I was looking for. I didn't know if there was something in the database I could add or if there's something on the template (admin) to modify.

Is there a way I can add millimeters to go along with 'in' and 'cm'? I looked on the forums and only found one thing but it automatically reverts back to inches.

I'm currently using the USPS plugin for my shipping. However I want to be able to add free shipping for products that reach a certain amount and or weight, How would I go about achieving this feature?