Post #1887: 
wilBr:
I need to call pie menu only if ‘press’ and immediate release
Yes, I understand. But why you need that release event?
PME has Confirm on Release option for pie menus. Have you tried to turn it off?
wilBr:
Yes, but for ‘DRAW’ not ‘CALL’ menu.
like the ‘expand popup dialog’, but for blender standard menus.
You can draw them it in Custom tab:
obj = lambda: None; obj.layout = L.box().column(align=True); bpy.types.VIEW3D_MT_edit_mesh_specials.draw(obj, C)
How to copy menu class name to the clipboard.
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