How do I set up a product modifier / shared choice that increases the product price by a percent value?

The only option I'm seeing is Price adjustment by dollar value since any other specification results in a:

"Price adjustment must be a valid monetary value."

Any help or advice would be greatly appreciated, as this is an important requirement for a site we're currently implementing.

Thanks,

Jake

I too am in need of this functionality. if anyone knows the right direction to point me in for adding this feature please let me know. To me the ability to increase a products price with a modifier by percent is a basic functionality that all E-Commerce packages should include.

Thanks,

Jarred Park
Kolb Net Works, Inc.
www.kolbnetworks.com