I've long used a Double-bit as one of my primary axes, an old four pound Plumb, and like you suggest above, I filed one of the edges far thinner than the other for a deeper bite, and left one factory fat for the stems that seem to be grabby and tend to get you stuck.
I use this as my scoring ax when hewing, (but juggle with a 5 lb jersey pattern) and it has over the years made some partners in two-man scoring a "bit" nervous, but have never had any mishaps. It actually makes for less bit damage when an occasional contact between the axes happens.
I bought it because it had plenty of life left, and was obviously good steel. Now I wouldn't want to hew without it, and would recommend one to anybody serious about axe-work.
"We build too many walls and not enough bridges" - Isaac Newton
