Announcements feature - choose users across multiple domains/broadcast frequency setting

Announcements feature - choose users across multiple domains/broadcast frequency setting

I am trying to select specific users from each of 3 domains to whom I want to broadcast an announcement. However when I select users from the 2nd domain, it deletes the users I selected from the 1st domain.

Also, in the frequency section, it would be helpful to have "weekly" as an option. Right now, I have to set it for every 7 days since I send a weekly maintenance reminder on the same day/time each week. It would also be useful to be able to broadcast to a computer rather than a user.

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