In ifconfig, after clicking on Connect to/Network Access Point (ex. iPhone device) in Blueman.
> For instances, under "Preferences", where the wireless and the wired interface is listed, add a third option for the Bluetooth?
Yes, but it may be hidden and appear automatically when bnep0 is discovered, if bnep0 or bnep* is how all Bluetooth Internet Tethering services are realized.
Until there would be a one-click-ed way to connect to Network Access Point service, by Blueman, I suppose, I suggest to add a balloon notification says "Bluetooth Network Access Point is available" with a "Connect" button on that balloon OR adding a check-box in preferences "Prefer Bluetooth Network Access Point".
> Where do you see this in the interface?
In ifconfig, after clicking on Connect to/Network Access Point (ex. iPhone device) in Blueman.
> For instances, under "Preferences", where the wireless and the wired interface is listed, add a third option for the Bluetooth?
Yes, but it may be hidden and appear automatically when bnep0 is discovered, if bnep0 or bnep* is how all Bluetooth Internet Tethering services are realized.
Until there would be a one-click-ed way to connect to Network Access Point service, by Blueman, I suppose, I suggest to add a balloon notification says "Bluetooth Network Access Point is available" with a "Connect" button on that balloon OR adding a check-box in preferences "Prefer Bluetooth Network Access Point".