I have been killed by the killshooter only a few times and always by having a frindly appear on my way from below my nose

Some solutions to this problem might be to change the punisment we get for hitting the friendlies...
-reduce the damage you recieve by half.. a good scare, but not always fatal damage.
or
-cause instant wounded effect on the shooter for hitting friendlies but no real damage. That would cut them off for a while
or
-cause temporary freeze on plane control (like the "do not move your joystick so rapidly" effect)