I'd run it by Lyle since he knows the module more, but I don't see why not. I guess the issue to consider is do all "required" attributes start with no default selected and will it be possible to include a "Please select..." line like on the checkout pages for zones?
That's my recommendation, to make it foolproof. The reflexive nature of "clicking to add to cart" could mean the customer inadvertently selecting the default option, without realizing they have a choice. I'd suggest that, if attributes exist and the select list is being displayed, have it set to "Please select the [option name]" or something similar; and if the user attempts to add it to the cart (using Cart Links or the add button) it kicks them back with a "You must choose.." message.
Joined: 08/14/2007