Comment 7 for bug 461427

A gconf/gsettings key is a good start towards fixing this bug, thanks Mathieu. But it doesn't count as a complete fix, since most people who use a wired connection don't know that gconf or gsettings exist.

The setting should be available in the Network settings panel, like it is in the Time & Date panel and the Power panel. This follows the general principle described in <https://design.canonical.com/2012/04/status-menus/> of "showing menus, and items in menus, only when they are relevant to you". If you're connected by a wired connection 100% of the time, displaying this fact is not relevant to you.