Turning KS off in the DA has been discussed ad-nauseum here already.
The reason KS is on, is because people didn't have the temerity to leave others alone. In short, the DA became a FFA arena, which was basically a day care for the less socially ept gomers.
Leave KS on, it doesn't stop the DA from being used at it was intended.
If you want to play in an arena where you can make any rule you want, may I suggest the H2H rooms? They are free, and you can create them as you wish.
cheers,
RTR