Maintenance Mode Toggle in the Top Admin Bar

It would be great to have a maintenance mode toggle in the top admin bar. For two reasons:

  1. activating and deactivating maintenance mode should take one click and not several clicks
  2. the admin should see at all times if the site is in maintenance mode or not, to avoid serious mistakes

When you are building or manage many sites at the same time, it is difficult to remember where you activated maintenance mode and where not.

Different colors of the toggle would be nice, e.g. red for maintenance mode, green for “online”.
The CMP Maintenance Mode plugin from the WordPress repository did it nicely, though it was a little glitchy for me sometimes.