I regularly tether my wifi xoom to a galaxy nexus. In the interest of preserving the phone battery I normally leave the screen off, however this can be frustrating when the connection drops - since the xoom reports a full wifi signal. Ideally what I want to do is replace the wifi signal strength symbol with the mobiles connection strength, however I'm anticipating it would have to be an extra icon in the "system try" of the tethered device.
I'm now going to speculate about how it would be done*: Wifi explorer reports the wifi signal of the connected device, presumably by dynamically writing the system data to the html file it serves. Something similar, paired to an app that reported the results in the system tray/dock area would do it.
- I think this is still in scope since it might help with an answer. It isn't a coding question since I'd never be able to build this!