Currently I use MyWi to create a WiFi hotspot for my iPad when I'm away from home. I know MyWi is currently not working on iOS 4, so I'm wondering if I do a JB, baseband-preserving upgrade to it will I still be able to (say) use the old MobilConfig trick to turn on the built-in Bluetooth/USB tethering? Then I could use a laptop to share that via WiFi. I'm really itching to try out iOS 4 but would rather not lose the ability to use my iPad at work. My iPhone is a 3GS with the old boot ROM, running 3.1.2 on a blackra1n jailbreak (never updated to 3.1.3).