In Blender 2.80 in Properties > Keymap if you use the standard Blender preset you get Preferences windows with option to check "extra shading pie menu items" option under Tilde Action. This option extends the shading pie menu
But when you use a custom Keymap the preference window is unavailable.
Is there a way to turn this option on other way?
I tried using python line that I got from the Info window but I only get en error
>>> bpy.data.window_managers["WinMan"].(null) = True
File "<blender_console>", line 1
bpy.data.window_managers["WinMan"].(null) = True
^
SyntaxError: invalid syntax