Allow the Removal of a Promotional Code at Check Once Applied

Currently in Pressero if a site is running multiple Promotional offers and a customer enters one for say 15% off Business cards but they also have a Special Offer code for $10 off and the customer enters teh 15% off and would like to change it to the $10 off as it is better deal, they can not do that without removing everything from the shopping cart and adding the products back in. Even saving the items for later like a Business card will not work, you have to DELETE the items from the cart and start over. This is a very poor Customer experience and even worse Customer Service experiance having to tell the customer what the solution is. We would like to see an option to remove any applied code at the checkout and enter a new one. Simply putting a delete/remove box on the applied code that would refresh the card and allow a new code to be entered would resolve the issue. Most ecommerce sites that allow discount/promo codes have a function like this.