gamerprinter
Mapper/Publisher
I see. I don't use undead alone in combats, unless is just a combat which only purpose is to show that there are undeads around.
So they have to take care where they channel to avoid healing the necromancers.
Still that give the cleric double die to roll.
Dividing how much die to heal and how much harm seems to have the same balance but it's more coherent with the flavor.
You must be discussing weaker, lower CR undead (like zombies and ghouls). Most of my necromancer villains are undead themselves, usually some powerful undead like vampire, lich, graveknight or ghost. That said, I agree with Billd91, clerics are too powerful of a class to allow positive energy channeling to do both healing the living and harming the undead at the same time. Separating those powers is a mitigating factor, and the right design decision in my opinion.