These features are exclusive to the PREMIUM version only.
Control Printoid with a keyboard
The Premium version of Printoid can be piloted by using a physical keyboard. This is pretty simple: just plug an USB keyboard (or connect a Bluetooth keyboard) to your device, then open Printoid.
Control Printoid with ADB
The Premium version of Printoid can be piloted by using the Android Debug Bridge (ADB). Following is a link to learn more about ADB: https://developer.android.com/studio/command-line/adb.html