GIN is Get It Now, you can set them up when you list the auction or by editing it, it is in the advance option section, you have the option to list GINS now that you have 5 seller feedback :)
there set it for today to win, I saw the GIN option but not comfortable enough to use it yet, still learning, I did reduce the shipping to 2.50 as low as I can go.
But didn't see a GIN option, you can't list one after someone's bid though but that's okay. :) I understand your thing with GIN not everyone likes to use it.