You would need to modify the python files for that.
Have a look in the 2.91\scripts\startup\bl_ui folder . There you will find files like space_view3d.py. In Bforartists hover over the menu, and have a look for the Python term. This term is the name of the class that contains the menu.
Open space_view3d.py and search for this class.
Hope that helps a bit.
Kind regards
Reiner
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