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Override your Maya duplicate hotkey (Ctrl+D) with this procedure to emulate XSI's duplicate polygon functionality.
So if you have faces selected, Ctrl+D will extrude faces, if you have edges selected Ctrl+D will extrude edges, if you have vertices selected Ctrl+D will extrude vertices. If you're in object mode Maya will duplicate the object as it normally does.
Speeds up polygon modeling workflow, or at least frees up hotkeys.