Checks for what? You mean you do not want the menu to close once an item on it is clicked?
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yes, this will allow multiple check options .
(obviously flatten can not be checked with graft).
its all about speeding up things 
cheers
Well, you can email Microsoft and yell at them for a bit for creating such a crappy UI platform. Way back when I was using RiscOS instead of Windows menus would stay open if items were clicked with the right-mouse-button instead of the left, but MS never adopted such a scheme.
Creating an entirely new menu framework from scratch is not going to happen for Grasshopper 1.0, buy maaaaaaybe with Eto and Grasshopper 2.0 we can make menus not auto-close.