Dynamically change X-ray value

the default xray mode sometimes is not enough but users are also not aware that they can also change the value but currently the problem is most user dont know about the hidden slider. So if the function is bind to current keymap Shift+Z to hold down and dynamically change Xray amount and see the changes realtime. when user release the keys, it should confirm the value and next time user can just press Shift+Z as usual. Also, there should not be a need to open the Viewport shading menu.