I don’t believe I can do that, first because the game still needs to be paused normally as usual, and second because it seems to have limitations (which I don’t know what they are).
I don’t know, but maybe I could create a pool that collects all active objects in the world that should be frozen when paused, and set their Custom Time Dilation to 0, freeze the AI Behavior Trees, and (somehow) “freeze” the physics simulation of every rigid body. I just don’t think it would be very efficient when there are hundreds of actors in the world that have to be (un)frozen. This would include all vegetation, destructible objects, and more.
Another way might be to call “Set Tickable when Paused” on actors that should still work when using Active Pause, and make sure it is set to false when pausing normally. However, I would still like to know what the limitations are for Tick while paused to make sure it works for me.