Emailnotification settings

Just configured the SMTP and tried with a first user to my new community. And I see there's quite a lot of emailnotifications:

• [Community] New User Registration
• [user] requested to join [space]
• comment
• tag

I noticed these settings in the screenshot, but they're missing options to turn off new user registration or user requestion to join space.
Also missing to set a maximum amount of emails per user per day. If there's some sort of heated discussion going on, that might easily be 10+ emails that were supposed to be a chat instead of posting and commenting on that post.

Or am I missing something?