jbo c, I ordered The Burrow from Stormcrow and initially when ordreding it I asked him for a rectangular TQ for many of the same reasons that you are stating. I wanted it to be versitle enough for summer and warm enough for winter use. By being able to open it up completly but in the winter have it closed off. What Stormcrow explained to me was that by not having a sewn in foot box, when it is closed off during the winter then you will have to much air flow in the foot box so it wont keep you as warm, but if it is fitted, then the down snuggles up against your feet creating warmth. In the summer I will just take my feet out of the foot box. Also I am figureing that for really warm weather I will just use a fleece liner from a sleeping bag paired with my Winter Ptarmigan and hope that gets me down to the 50's. Remember most of your warmth comes from the under insulation. So I went with the sew in foot box (as per Stormcrow's advice) so when I winter camp I will have ultimate warmth, and in summer and really warm months ill use a fleece blanket or a light claimshield quilt of some sorts. HOpe this helps, I know some of these decisions are hard to make. Makes you want to buy one of everything from every vendor
Sometimes I like to hike and think, And sometimes I just like to hike.
Hiking is'ent about waiting for the storm to pass its about learning to hike in the rain.