Correcting order attribute at checkout.

**Senario: **After checking attributes and adding product to cart the customer is then presented with the cart, if he/she discovered a mistake they need to click on the linked product (which is not very obvious) correct the options of the order change the add to botton to 0 and click add this to cart other wise they end up with 2 Quantity and have to re-adjust. ***Not very user friendly to your average consumer ***what can I put to dysplay when they view the cart to show a link to correct/update eg. something that says **update attribute **that will get the customer back to the product with what they had checked or typed in the option values or attribute in order to correct it and click on an update botton that will update the attributes without adding an additional quantity. Is this easy to do?.

At this time, update vs add to cart is not available for Zen Cart ...

This is not an easy change ...

Making an update vs add to cart can be complicated in that some want to Add the same Product multiple times with different attributes and others want to update the existing Product and not add a 2nd Product ...

I have worked on making update and add to cart buttons in the past for some custom sites and it requires quite a bit of custom coding to make it smart, user friendly and flexible ...