This one will cause a lot of envy amongst those with non-developer/ChevronWP7 unlocked phones. Developer CodeJoker has gone ahead and done the obvious: create a shortcut to the device WiFi settings. It's exactly what you think it would be--you tap the icon and you're at your configuration to turn WiFi on or off with a few less steps than the current setup. You simple install the XAP file and you're good to go, not really much to it and it works as advertised as you can see above.
Could this be technically submitted to the Marketplace and approved? We don't really see why not, it's not so much a hack and just creating a shortcut. But until then, you'll have to go the unlocked route. We're also pretty sure Microsoft has to be working on something similar from their end, hopefully some type of tile --> folder --> icons system, making such ritual changes much more easy.