Since Ubercart 3.3 now supports configurable AJAX at the checkout, it would be interesting to optionally remove the "Apply to order" button. This way, coupon could be applied via AJAX, and for touch devices, or all other situations this could happen when "Review order" is pressed. This would help me with situations where users enter a coupon but forget to click the Apply to order button.

Do you think this feature request makes sense?