Hey Maureen,
We do have a ticket in with our development team who is actively working on a fix for the Google Calendar sync. There have been reports of constant disconnects from multiple clients.
Having a one click option to sync all Method accounts to their Google Calendar will be tough to accomplish, the way the handshake works between Method and Google it requires going into a separate Google screen to give permission for Method to have access to your Google Calendar. And that requires you to be logged into each separate Google Calendar account.
But I'll definitely bring it up with the team and see if this is a possibility.
-- Mortaza