I'm not totally clear on what your asking:
Are your asking why when you enter Measured Width Feet it doesn't automaticly populate Measured Height Feet with the correct ammount(IE Width*136=Height)?
As for the variant boxes not working, it does work, I added a test product that uses it here. It's most likley something in the way you have your product setup, are you trying to have a variant field auttomaticly populate another variant feild?
Thanks!
Christian