There are several features I'd love to see in the product options function:
#1 bring the inventory function over to the CCK and Joomla areas. Right now we can't track inventory per option.
#2 If the base price is set to zero, and there are product options, hide the zero price and only show the product option prices with any + or - symbol so it's just Option 1 is this price, Option 2 is this price.
#3 Allow for downloadable items as an option. This would allow for a single product to sell both a regular book and an ebook with a download for only the ebook option. Or a regular CD and MP3s, with only the MP3 option having a download attached to it.
I think these would really make Quick2Cart more flexible.