I hope they begin offering the option of purchasing their AC to DC adapters with or without an On/Off switch. Some of their buildings do have an On/Off switch on the structure (American Power & Light, for example), others don't ( the newly issued Schneider Freight Building). I've done it, but I'd prefer not to mess around with placing a switch in-between the adapter and the building. Simply stated, it would be cleaner for every adapter to have an On/Off switch as an option. In fact, there's an active thread right now on how to set up a DC powered building with an On/Off switch. It's called "Power Supply for Menard's Buildings".
Just a thought.