I haven't tried it yet to see how it affects gameplay, but the stamina bar was always one of the most ridiculously unrealistic elements of BF/FH2. When I first started playing FH2, it just cracked me up that I was supposed to be a soldier who has been through basic and probably a few years of war already, yet, when I'm being chased by a Panther I can only run for about 30 seconds before I have to find a patch of tall brush to take a nap in. I mean, I know my soldier probably smokes a pack of Lucky Strikes every hour, but this was before McDonalds made everyone morbidly obese.
I've noted a lot of people saying this will make maps seem tiny and such, but I see this is a separate mapmaking issue. The fact of the matter is if the army found out you couldn't physically run for more than 30 seconds while being chased by a tank, you probably would have been given a medical exemption or relegated to the kitchen.