One, this would make cry of thunder vastly overpowered in that it would be available once every fight, I'm not sure how you propose it be tweaked accordingly such that it is still balanced.

Secondly, it robs warriors of some long lasting spell saves. For example, let's say I put up my warcry and a necromancer sleeps me. Since I'm not fighting, it wears off, and I lose -12 saves vs. spell while he maledicts the hell out of me.

Finally, I believe warcry takes mana. If you are going to be using warcry all the time, the mana costs would have to be lowered accordingly.

I don't really remember why warcry was changed from being able to yell it anytime to only during combat, but whatever the reason was, I've gotten used to it, and I'm sure it is still valid.

If anything I'd like to see berserk changed. At low-mid ranks berserk is used for healing after a fight rather than fighting better during a fight. I'd have to say 60% of the time when you are ranking, warriors berserk, then go right to sleep to heal up.