I want to create a keyboard shortcut to quickly label a selected node.
The ideal shortcut would bring up a text box to show input, and then pressing Enter would assign the text as a Custom Label.
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You can't do precisely what you want, but SHIFT-ALT-L will bring up a dialog that allows you to quickly modify the label (Not sure if this requires Node Wrangler or not. If it does, simply enable Node Wrangler in user preference -> Add Ons.)
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$\begingroup$ Complementing the answer, using the Node Wrangler addon, if the label previously has a custom name, first use Alt L to clear the name, and then use Shift Alt L to give a new name (in the Add to Beginning field). $\endgroup$ – rdllngr May 21 '20 at 23:26
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As of version 2.81, Node labels are now quickly renamed with the hotkey F2.
Additionally, Ctrl F2 opens a Batch Rename window for bulk editing. These shortcuts also work with Objects, Bones, and Collections.
(Note: I originally posted this question in the context of version 2.79)
