Yes indeed. Google can be heavy handed and not provide comprehensible explanations. I've dealt with that in regards to AdWords.
In latest 1.4x version Ropu has provided support for auto disabling GC button when "virtual" products are in the shopping cart.
I suspect the same code could be reutilized to disable the button when testing other DB values. You would need to assign an existing field with common data for the products you don't want to be ordered through GC for this to work. There are various methods to manually add a custom field. Use the short description mod as a guide (or use the short description field itself for this purpose).
Recommend adding your request to the wishlist on the new support forum for the 1.4 mod.
I would like to see out of the box support by Zen Cart to support extra additional fields for each product (out of the box support). I suspect this idea is already under consideration and to be implemented in future product_type architecture update.
This would make mod developers and merchants who wish to make quick and easy shop customization much more happy.
Woody
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