GC, discount coupons and gift certificates! Oh, my!

Scenario one, only gift certificates in the cart: Google goes by the rules and refuses to apply a discount coupon.

Scenario two, any other non-virtual store item in the cart along with the gift certificate(s): Google applies the coupon to everything (gift cert. included)!

I can't allow people to purchase gift certificates with a discount applied. Any ideas, thoughts, comments, etc.?

Info: all of the directions followed to a T on creating gift certificates and everything on Zen cart side working great. Hey, even Google's working great as long as you don't buy something non-virtual along with it.

Thanks in advance!