Another vote for separate Siren / Alarm modules here, but also integration with the doorbell camera chimes.
Ultimately what I would like is to be able to put something like a chime in multiple places around the house that can ding when a contact sensor opens, motion sensor is tripped etc. since I am not always able to hear the hub. You could also have the chimes sound the 30 second [or whatever time you choose] entry / exit delay, ideally along with they keypads. I have 2 keypads at entry doors, it would be nice for them to beep on entry if the alarm is set, but the chimes doing so would also work. Equally, it would be nice to have a chime in the bedroom so that when the contact / motion sensor trips it would alert me,
Secondly, and this would need to be a separate product, but a very loud siren/klaxon type thing for when the alarm is triggered. Most normal home security systems have this, as a way of alerting anyone in the house to an intruder, encouraging an intruder to leave the location and alerting neighbours to a problem. I have a friend in the security field and he recommends having strobe lights & a siren inside the house as well that is painfully loud as a way of encouraging unwanted guests to leave. having the ability to install multiple, both inside & outside, would be ideal.
If the siren and chime could also be tied to actions from other devices, that would be a bonus. For example, person detected on a camera / doorbell, make a noise to let them know they have been detected. At the same time, have the chimes in the house announce person detected at the front door, even if they don’t ring the doorbell. Many a time I have had a package thrown on the front porch but not known because they didn’t ring the doorbell.