“extra shading pie menu items” option not showing in custom keymap

Question

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

Answer 1

"extra shading pie menu items" is available if you manually change the keymap name from VIEW3D_MT_shading_pie to VIEW3D_MT_shading_ex_pi