Bluetooth detection behaviour

[fcig]

Hi, I installed Voice Notify in my Xperia Z1 (Android 4.4.4) and it seems to be very close to what I'm looking for, the only problem I noticed is related to the headset setting.

I would like to use voice notification when I'm driving so I enable VN to work when screen is off and on and when headset is on (when the phone is connected to my car radio using bluetooth), but I noticed however that the voice notifications were blocked and in VN logs show that the headset was off. I didn't undestand that and made some tests with a BT headphone. I don't know if this behaviour is known but VN only reads a notification if the BT device is connected as media audio at the BT device properties. If I enable only phone audio VN thinks there is no headset, and unfortunately my car stereo only works as a phone audio BT device.

Is there a way to detect these devices as being a headset on?

Thanks.