Something a little more convenient, like a single button? There are times when you get aggro and mobs are all over you, so you'll want to kite and dodge around while trying to leave group. A little irritating to have to do the right-click and select from menu.
Something like a EJECT level on a fighter jet if you will.
No words… can …
I'd work on your attitude before trying to find a convenient way to quit groups while kiting mobs.