Just a short "Fix it during your coffee break" notice: There was a mistake in the tutorial, concerning the submenus folder. Of course it's not /home/user/.config/menus/hildon/submenus but /home/user/.config/menus/submenus - unless, of course, you specified <MergeDir>hildon/submenus</MergeDir> in your hildon.menu file!

Thanks for helping spot the mistake, rantom!

*back to work*