Adding external siren

[pablogfb]

I can’t understand how this is so wrong. I have 2 requirements:

• When the alarm is triggered also activate an external siren
• Be able to share the alarm control to other users

Well, this seems to be totally imposible to achieve simultaneously:

If you use the implemented “Alarm” system you can’t add an external device (like activating a smart plug when the alarm is triggered)
If you create an scene, simulating an alarm system, you can’t share it with other users.

am I wrong? it is totally insane. Why you can't activate some actions (plugs, lights...) when the alarm is triggered? Seems like a very basic request...