Whether it’s simple or not is a different question, but if it were possible it would have to be a separate option, so that you could toggle it on or off. I don’t want to see notifications of any arm/disarm activity, because I am the only user, and if I’ve just armed/disarmed the system I will know, so to then be told about it would be annoying. I do however still wish to see scheduled arm/disarm notifications.
In your case, I see the point. Perhaps many others are multi users, and would find this useful, but maybe the lack of replies would suggest the interest is somewhat limited. Not sure.
I made a suggestion a few weeks ago, and there was zero interest, so I concluded I was the only one who would have found it of benefit and have left it at that.
There are many other things, that have been requested by many, repeatedly, that still haven’t been implemented, so I can’t imagine yours or my suggestion being very high on the priority list. For example, although I’m an Android user, I know from reading the forum that many iOS users do not get reliable notifications, or badge updates. If it were my priority list, that would have to be much higher up.