I agree with the statment from ppl that if there should be a summon system its very important to take away scent and summoning ability from when you defend youre self.
If you get hit first or someone raid youre town and making the town attacked you shouldent drop any sent at all.
But on the other hand if you take away summoning totaly you have to take the oppertunety to kill hostiles when they attack you rather then chasing them down, if someone got a murder alt only logged in a couple of hours every week then the murder alt isent really a problem since they only got some hours to make mayhem with it and will never rule the world with it then they will rather kill one to two chars every week but on the other hand the one attacked can be online 24/7 if they like all week and making there chars strong.