The main Item menu is missing grouping options. Usually the main menu of an application provides access to all major features. Grouping is certainly a major feature, and currently it's only accessible in the right-clock menu when in Icon-view. One particular need for having the Group sub-menu accessible from the main menu, is when in Preview mode, which currently lacks a right-click menu.
*** Bug 472878 has been marked as a duplicate of this bug. ***
Two additional advantages: 1. As Maik has pointed out (in another bug), main-menu items are available as toolbar actions (ie. can be added as toolbar buttons). 2. Similarly, main-menu items can be assigned keyboard shortcuts.
Would like to voice my support for this enhancement! > main-menu items can be assigned keyboard shortcuts This in particular would help my workflow a lot.