I had a better idea that will work without performance downside: Target groups.
For any group, you’ll have to specify only one target in the rules and all other group members will be added as targets automatically. Groups will be editable in a separate parameter and at runtime through the JS API.
That still requires setting up the group once on your part, but I think that’s worth it in terms of making the game run smoothly on weaker systems. I’ll see if I can add it to the release candidate within the next few days.