What to do for visitors?

I use presence detection for arm/disarm, but what to do for visitors? I'm trying to figure out if it makes sense to still install a keypad, something like 

https://smile.amazon.com/SECO-LARM-SK-1011-SDQ-ENFORCER-possible-programmed/dp/B016JAV6WK/ref=sr_1_7?ie=UTF8&qid=1546278581&sr=8-7&keywords=alarm+keypad

Perhaps some other method, my Mother in law comes over some times and I don't want to go through setting up presence app for her etc. What is everyone else doing for those kinds of situations?


Also thought about disarm on a good unlock of the front door.