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Using Alt-F bring up the file menu. While doing it a second time does bring up the format menu, maybe a different shortcut for the Format Menu might be good?
Also, could we have a shortcut for inserting a horizantal line?
The menus are reorganized in the next release to more closely match Evernote. The Format is Alt-O and the Online menu is removed.
You can create or modify any of the commands by creating a ~/.nevernote/shortcuts.txt and specifying a shortcut for Format_Horizontal_Line. The file /usr/share/nixntoe/shortcuts_howto.txt has more information and /usr/share/nixnote/shortcuts_sample.txt has a skeleton file. The user manual also contains some of information.