I have a few automations that turn on / off all lights except a few specific ones.
It would be great to be able to just add that list to the turn on/off service as a parameter instead of using a template.
Isn’t that what scenes are for?
Can you provide a more specific example?
If you’re asking for a way to run a scene, but exclude some devices, check out this WTH: WTH - Why can't we apply a scene to an area?
If you’re asking to call light.turn_on
on an area minus a device, that doesn’t exist yet. While it is a good WTH, I would recommend against using this feature(if it existed) because of the potential headache it could cause.
For example, imagine you target the lights in your living room minus the side table lamps. What happens when you add a new lamp to the room? It won’t be excluded and you’ll have to update every automation with the exclusion. As @sandman98321 mentioned, a scene is more suitable because you update new devices in one spot.