My suggestion is that the SDK adds a "mirror" and "particle" layer in the unity editor. Anything under these layers can be toggled by a button in the in-game menu allowing players to adjust visuals from the menu without needing a physical button in the map (assuming the map even has one)
This could be handy if players are far away from said button or if going near mirrors (which is usually where world creators add mirror buttons) affects the framerate too badly for comfort.