Another idea might be to add a right mouse button context menu in ma_customize:
see
http://osd.cad.de/index.en.htm ->
Place Machining features...
since it's all the same for all holes I did the job within a loop for all known machining holes. I added more than just 'next' and reused some already existing icons.
Well, I do not know how other input devices react on/with (mouse-) RMB menus.