Adding option to Not use existing item_option_group value as the default select option value

[ChrisFreeman]

I would like the default item_option_group value be a non-valid "Choose Size" (or similar).

Currently, there doesn't appear to be a way to specify a non-valid option as the default option_group_value. I hacked a solution by altering the product_detail template to insert default option outside of the recommended "{% for option in options %}" loop:

<option selected="selected" value="">Choose Size</option>

I then hacked the SimplevariationsCartDetails.post method to modify the "key.startswith('add_item_option_group_') section to check for an empty key value:

if not self.request.POST[key]:
    messages.warning(self.request,'No Size Select!  Please select Size below.')
    nextURL = self.request.GET.get('next', '')
    return HttpResponseRedirect(nextURL)

Aside: I also modified product_detail template to include a "next" value in the product_detail template form action attribute, so it would be available above.

I'm not sure if this is valuable to others, or if there is a way to incorporate this as a feature that can be enabled/disabled to allow adding into a pull request.

Thoughts?