The short answer is no, you cannot use the ADT hub to turn on say some lights if security is breached.
Yes there is a APP that you can for now use, but that app is not in my opinion going to be around long. Samsung is in a transition period with smartthings, and it appears that the developer access where you can do things like that is going away, but I have no real first hand knowledge or proof of that.
If you have the “regular” hub (I have both at different locations) you can set up an automation that says …if motion A is detected AND security mode is “away” then turn on smartplug B
What I am finding while programming both hubs pretty much simultaneously is that the ADT hub’s only good points are ADT services and a touch screen to view status, and arm/disarm. Other than that the ADT hub to me has a lot less flexability when it comes to security.
Thats just me but I am literally programing both hubs and trying things side by side.
If it were not for the ADT services that we will be starting subscriptions for, I like the regular hub muchg better.