Konnected itself is not an alarm system. It is a way to connect your wired alarm components, like door and window sensors, to a smart home hub, like SmartThings or Home Assistant. The behavior of the alarm - when to trigger, what to do when triggered, etc., is all up to the programming in the smart home system of your choice.
Before getting started with Konnected I strongly recommend that you be familiar with a home automation system, as you're going to need to do a non-trivial amount of work with it. You're not going to get any of this for free from Konnected and you're not going to get support from Konnected on the automation side of things.
In Home Assistant there are a few alarm components, for example
as far as I know they all offer delayed entry, so that you have time - how much is up to your configuration - to disarm the system when you enter, before it triggers a siren or whatever else you configure.
At least one, but not all of, the HA alarm components offers different delays for different zones, so that if someone enters via a window the alarm will go off immediately, but if they enter through a door they have X seconds to disarm before the alarm automation is triggered.
Similarly, integrating a tablet instead of a keypad has nothing to do with konnected, and everything to do with the home automation system you choose. There is good support for doing what you've described with Home Assistant.