A lot of the questions asked so far can be answered by reading the User Guide
However, one thing that wasn't clear to me relates to the Bluetooth radio. Presuming it is turned on, does it turn off when the handheld radio is turned off? I'm trying to understand if there's effectively an "airplane mode" which turns off both radios at once, or if it's a two step process.
BTW, the User Guide refers to a number of features that I'm guessing are in 4.0. It's a good read!