I use a similar keypad, XFinity Centralite 3400, as the primary method for arming and disarming SmartHome. The keypad sounds tones during exit / entry delays, and a lighted button can show the system “armed status”. Keypads are 100% community supported devices, no Smarthings support.
I use the following apps with the Keypad
@ethayer Lock Manager (Allows for multiple keypads, multiple users, pins, including date and time sensitive pins)
@arnb SHM Delay (Adds Exit and Entry Delays to Smarthome)
There is also @bamarayne Keypad Coordinator and Webcore to do some custom functions without coding a SmartApp. I use my own small SmartApp and a few unassigned pins to: open and close the garage door, and toggle some lights.