Post #1669: 
Pinhead:
It is possible to set the custom toolbart to be visible in “Toggle Maximize Area” ?
No, looks like maximized area doesn’t support area splitting.
But you can add custom widgets to the header.
Pinhead:
is possible in 2.8 to create custom toolbars like in 2.79
Not yet, but I’m going to support them in Blender 2.8 Beta.
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