Luke Gedeon

The default position for the menu in WordPress 2.7 is on the left, but since the scroll-bar is on the right, some people wanted the menu over there too. Plus a lot of blogs/websites have menus on the right so menu on the right seems to be a pretty popular option.
This plug-in moves WordPress admin menu to the right side of the screen.

Admin Menu on Right

Moves WordPress admin menu to the right side of the screen.

Sohan Zaman

This Plugin will save your time by adding a duplicate button on each menu item while editing a menu. A real time saver. Currently it doesn\’t support customize screen, but I\’ll add it soon. If you find any bugs, just head over to support forum, I\’ll fix that asap.
Please rate me a 5 star if you find this plugin helpful 🙂

Nav Menu Item Duplicator

A simple plugin that adds a duplicate button to each items on edit menu screen.

Admin Menu on Right vs Nav Menu Item Duplicator