I hope there is still help for this contribution!
First, this is the best added fields module I've seen across several different shopping carts.
I am using this in a on-line craft store and have successfully been able to make cosmetic changes to the fields in this way:
Changed Directors to Brands
Changed Actors to Themes
Changed Regional Code to Album Size
Changed Language to Colors
Changed Subtitle to Yarn Type
Changed Length to UPC Code
I am leaving the other fields open to change as I work with my different products.
But for now, how difficult would it be to add the ability to search on each of the fields, except the Length/UPC Code field? It it isn't too hard to add, I would love some help in this area!
Thanks in advance for your help!