This is a documented shortcut, but I find it fairly useful, especially if you do a lot of nudging and work in grid mode often. If you are like me, you often have to drop down this menu and change your grid or nudge value.
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To switch your nudge value, hold ⌘⌥ (command option) and press the + or – key (num pad or regular will work).
To switch your grid value, hold ⌃⌥ (control option) and use + or -.
Happy nudging!!!

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