Look, i have an idea:
-When the impostor kill anyone,his step is with blood, but for 3 seconds, and any crewmate too.
Exemple:
I am a crewmate, if i step in a dead, my step was blood too
-Among Us need an sheriff, the sheriff can use a gun, a pistol.
But he can not kill 3 crewmate.
i have no more idea, but that mine, Bye!