Hello... My name is Chris and I'm short....
isn't it possible to cinch down the last few inches at the foot of a regular mummy bag to give you a more snug fit?
I'm 6'4" and I have a long MontBell that came with a draw cord at the foot box already built in so I guess it's a sanctioned idea. Their bags also are "expando" so they will wrap nicely around you but will stretch out as you assume the fetal position or pull one leg up. Large temp range of bags from -20 to +40. Stick with down for it's weight and compressibility. 800+ on the down.
http://www.backcountry.com/montbell-sleeping-bags?CMP_ID=PD_GOO001&mv_pc=r101&s_kwcid=TC|5485|MontBell%20sleeping%20bags||S|b|6473302124
