XSI's 'Shift-click to check/uncheck multiple' inside a Qmenu?

[Tim Crowson]

I'm asking this here because XSI users will immediately know the 
behavior I'm trying to emulate. I want to recreate Soft's menu behavior 
whereby shift-clicking on a menu item will check/uncheck it, but keep 
the menu open and let you click on other entries as well. Is this 
behavior reproducible in PySide/PyQt, if so how? I'm searching around 
now, but wanted to drop a line here too.
-- Tim Crowson
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