X-Ray mode for Armatures

EDIT: Marking as done. As of today, toggling the x-ray mode (shortcut: ⇧ Shift Z ) while in pose mode have the desired effect:

Since multi-object editing is coming, I can't stop thinking about future possibilities for animation in Blender. One of them being to animate several armatures (like two characters interacting with each other) in the simplest way possible.

With that new possibility will come a new problematic: how to use armature x-ray display quickly and easily. Until now we just had to open an armature's display setting and check the x-ray options. But it's kind of slow, especially with multiple armatures.

But there is a nice feature in Maya called "X-Ray Joints" ("joints" are Maya's "bones") :

(photo credit: tutsplus.com )

This is basically a drawing option, consisting of drawing all armatures in x-ray mode. It's a 2-click solution (or a one-keyboard-shortcut), no matter how much armatures are here. Still faster than the usual way, even with just one armature). And for those willing to x-ray only one armature, the usual way. On a practical P.O.V., this could look like this :

• Enabling or disabling this would respectively enable or disable x-ray of every armature, no matter how they were set.
• When this option is enabled, should the armature's x-ray options be greyed out ?
• To me, it's a shading option, bu since it could be used in rendered mode too, should it be placed in another pop-over, like "Overlay"...?

Thx for making Blender awesome.