Yes the F2 trick is in the manual:
http://manual.calibre-ebook.com/gui....oard-shortcuts
Quote:
F2 (Enter in OS X): Edit the metadata of the currently selected field in the book list.
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No it isn't editable, so it won't appear in Preferences ==> Keyboard
Testing templates elsewhere... sure. You can generally right-click an input box and use "Open Template Editor".
You can also use the Template Tester by clicking a row in the main spreadsheet view, and using the shortcut key CTRL+T (or adding the appropriate toolbar icon wherever you want).