Makes sense man, I know what you, or the OP means about war flags between the players involved and not a flag to all (ie: not a gray, freely attackable to all flag), but to me that's like, say A is blue, B is blue, B attacks A and goes gray to do that, then C heals A, then what you're saying is now C should be gray to B. So what that means is now B can kill C without C giving B a count, then B just leaves so A can't give him a count. To me, that's sorta messed up, circumvents the murder system.
All that, and the OP is basically complaining about the guardzone, or his lack of ability to kill people in a place of his choosing, and blaming the flag system for his incompetence. I'll say it a third time, for people who can't kill people near a guardzone, just move the fight. Simple.
I've killed plenty of people and been killed by plenty of people at Yew Gate, I'm well aware of how to kill people before they get back to the GZ. If this OP can't do it, he can't blame the GZ for his failures.