Default notification preferences

I think we really need an account setting that allows us to set default notification/alert preferences. I see 2 options for how this works with a 3rd possibility that is quite different as a global setting.

1. Any new forums or teams you are added to will be set to use your default notification/alert preferences. Those individual forum/team notification settings stay that way once created, even if you change your default preferences. This is probably the easiest to implement because it requires the fewest changes to how things work now.
2. Any new forums or teams you are added to will inherit your default notification/alert preferences until changed. This requires each forum/team have a new option for notifications: "Use my global preferences". You can override an individual forum/team to always show you notifications and/or alerts. Doing so "pins" that room to those settings regardless of changes to your default preferences. Additionally, those rooms set to inherit will always follow whatever your default preferences are set to.
3. This last option is could be in addition to one of the above options or just in lieu of them entirely. It would be great to have some global setting for notifications and alerts that I can switch on and off across the entire application. I'm trying to avoid a direct comparison to the "other communication tool", but one thing I loved about it was the ability to disable all notifications/alerts entirely or to only worry about messages where I am @-mentioned.