I am not sure how, or if you even can, do this. The role of the person is context specific, and if you can't get the context of the item, I don't see how you could then see what roles the person held within that specific context.
Perhaps I am missing something, but why are you putting a control for an object in the Quick Links menu, and not under a menu for the object. How is the command going to know what item(s) should have their attributes modified if it is up there. Shouldn't it be on an object specific menu?