Heres an idea for spawn kill: Don't start the protection clock until the player moves their mouse or moves the character from their spot.
This will be a little hard to incorporate with for example the sneaky cheat code. Currently, with the sneaky cheat code, you are invisible when you have spawn protection. So if we were to do that, people would likely abuse this by using to sneaky cheat code to camp warps until its the best time to strike. This, on the other hand, is a brilliant idea.