As the subject says, most of the time I like to be able to “turn off” actors for test purposes. Say you’ve got a bunch of AI spawners and you want to not spawn AI temporarily. It’d be really useful to be able to disable certain actors for a quick playtest session. So having a toggle in the outliner (right next to the visibility toggle perhaps?) would be very useful.
Also, make that work for ALL actors, brushes, the lot. Basically a way of not having those things in a game during runtime (not in PIE and not in the packaged game) would be good.