I think that some people missed my point. I don't have my books handy, so I'll make stuff up. It should get the point across.
Let's say that I have a spell that does 3d8 damage and temporarily charms a monster. What I am advocating is the option, whether during combat or not, to remove the damage from the spell and just keep the charm effect that it says. If you want it to deal damage, it does. If not, it doesn't. It's rather simple.
I've heard that Forcecage does damage and puts people in a cage. You could describe a normal one as popping up small or buzzing with energy, so it hurts, or you can create a special one that just puts people in a cage without hurting them. You make the choice on the fly.
Is this sort of option stated in the rules? No. But it's such an easy and minor change to make. It does absolutely NOTHING to change the balance. It does, in fact, give you just a few more options to not hurt people.