I think the alarm system part in a smart home is very important. But it is always second place in all systems. Lights and routines are always first. If your Dashboard supports the alarm system part it will become a must in my opinion.
I created with CoRE Piston a entry delay in smartthings. I replace the real Entry door sensor by a Simulated sensor. When I armed system away, I make noise for 1 minutes, after 1 minutes I stop sound and if real entry door is open I make noise 1 minutes and if system is not disarm in this minutes I turn on Simulated entry door sensor and smartthings send Alarm.
Possibility for add sound noise when arming system away. And in the future maybe add the entry delay.
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