Feature request: fix position of accordions in menu manager

As a webmaster for large websites with REALLY HUGE mega-menus (80+ menu items), it’s very disappointing the fact that whenever you have to add specific individual items to a menu, you have to scroll all along the menu tree to lookup the items to add in the accordions.

I use to fix this by modifying the behaviour from the Inspect Element option of Google Chrome, injecting this little piece of raw CSS:

ul.outer-border{position: fixed;width:25%;}

This will make the accordions group being always visible independently of how long you have to scroll. The width of 25% works well to my screen, but surely have to be tuned.

I think this is a great feature to add that may simplify usage and allow us, webmasters, to work faster than before.

Hope you can consider it for inclusion. Best regards
??

Marcelo