Special as % off of total price

I'm trying to find an extension that allow you to provide a percentage as the product special price and apply that to the price of the product, but AFTER the options have been applied.

I am using Enter_Percents_For_Discounts_and_Specials.xml by Qphoria, but that takes the percentage value, converts it to a numerical value based on the product price and commits that to the database. On the front end, this value is taken off the base price, ignoring the options.

I need a way to keep it as a percentage and take that percentage off the total cost after the options for the product have been defined by the customer.

I am using the Dependant Options extension to handle those (http://www.opencart.com/index.php?route ... on_id=5214) and also Option Price Update Redux (http://www.opencart.com/index.php?route ... on_id=1458).

Is there anything out there that fits this purpose?

Thanks in advance!

i have created such mod:

http://www.opencart.com/index.php?route ... 20discount

It wouldn't display as a special price, so it may or may not work for you, but you could use Formula-Based Fee/Discount (or if you need product restrictions, Product-Based Fee/Discount) to give a discount on the total price of the cart, including options.