Awesome features like customizable report frequencies and on/off status recovery after power failure will be fully available to you once the handler is installed. Note that you'll only be able to take advantage of these settings using the Classic app, not the newer SmartThings app, since the new app doesn't give you access to advanced settings as of January 2019.
If you haven't added handlers before, the process is straightforward and only takes 5 minutes. Here's how to do it:
You will need to repeat the above steps to add a second handler which will create the additional devices for each outlet and USB port in the app. Please click on this link to access the code for Step 3.
Now add the Double Plug to your system using the steps here (ignore the first half about custom handlers since you've already added it).
Once the handler is installed and the plug is included to your SmartThings network, click on the Double Plug in your Classic app and click on the gear icon in the top right corner to access the device's advanced settings.
If you're having issues during the handler installation process or anything else, let us know! We'll be happy to help.