IMHO, when it comes to survival, the less you do the better off you will be; it is all about conserving energy and avoiding injury.
In the very short term perhaps. I can gather food and water using far less energy than it expends (digging for roots, gather plants, set traps, etc.)
While energy conservation is important, as in don't run around like a spaz screaming and jumping up and down, making the situation as comfortable as possible is just as important, if nothing else it improves morale, keeps you busy and gives you a mental advatage. You are doing something prodctive, not just sitting being miserable. Survival is much about mind set.
As well, when I look at my bulging belly and love handles, I have plenty of stored energy, what Ron Hood calls survival muscle, to keep me going a long while.
As for pommels, as has been pointed out, if it increases the scope of work a knife is capable of, and there is no real cost in performance, then I am all for it.
Newt Livesay used to make a knife called the TAC or TEAM knife (it was an entry tool but would be a damn good survival knife) or something. It had the best hammer poll ever designed IMHO. It was in integral part of the knife, there may be pics on the web somewhere.