I learned that to cancel ANY component of a $4,000 flight/hotel/car package, my refund would amount to $100. Terms and conditions call for a prepayment penalty--I was fully prepared to have to pay a reasonable amount (even up to 50%!), but this was highway robbery. I WILL NEVER NEVER NEVER USE ORBITZ AGAIN... and I write this in the hope that others will learn from my very expensive mistake.
We do have that new menu filter in the works, thank you for the suggestion!