“Tyler, would this make yours a 25 degree bag? Otherwise, I’m confused as to why you would want that option.”
JP, I’m relatively new to quilts so I don’t know what temp rating this would end up. I didn’t pursue this particular information as I decided not to go that route and just ordered a plain ‘ole 20*. The reason that conversation actually came about is because I asked them if they could overfill certain baffles to make “hot spots” as I was considering ordering one for my wife and women need to have a warmer core. As to your question about why you would want to do that for an entire quilt? Honestly not sure…Since this is effectively another verbiage for the simple idea  of overstuffing, I guess the answer would be the same as to why people used to order an over-stuffed revelation back when they offered it which I can only assume was to prevent down shifting.
FWIW, this is the exact response they sent me via email:
We do not offer overfill in the typical sense, the two reasons to get overfill are for lower temp ratings, but we offer ratings every 10* so if you need more warmth go to the next rating. The other reason is so down does not shift, but our unique baffle design makes it so down does not shift while you sleep making for a better nights rest. If you still want overfill what we could do is use a smaller baffle in your quilt which would puff up your quilt more and make it even harder for down to move in your quilt (so use 30* baffles and stuff it with 20* temp ratings). If you want this it will not cost you any extra, just in your order notes we request that we use the next smaller baffles (so if you order a 20* request a 30* baffle) and we can do that for you. Keep in mind that this will make your quilt custom and will not be able to be returned or exchanged. Let me know if you have any other questions.