I'm not sure I understand.  Are you looking for f2 or n, to engage the Node tool?
http://inkscape.org/doc/keys048.html
 
From: Dipak Chaudhari
Sent: Monday, September 01, 2014 7:35 AM
To: inkscape-user@lists.sourceforge.net
Subject: Re: [Inkscape-user] Keyboard shortcut for the "edit object"functionality.

 Hi,

 I can invoke the "edit object" functionality by double clicking on an object. I would like to bind a key to this functionality. Is this possible?

About the Edit object functionality :
For paths, double clicking switches to Node tool; for shapes, to corresponding shape tool; for text, to Text tool. For groups, double clicking performs the "Enter group" command.

Regards,
Dipak


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