here is my input
1: no, for some reason it just does not feel right. To hard and when I tend to change lanes im not making a drastic turn. Even sittin at a light id feel more confy about the police if i were to turn on my signals while stoped or befor i turn. EDIT: oh head lights duh.
2: maybe... have to be low power id think and would still have to have a key. good idea but id rather go with key.
3: maybe would be cool to hear my car say good morning before i insert key.
4: yes if you can direct it to just them. i have a buddy who uses his cb in his truck. through fm or something i have no idea. just cranks it up i suppose.
5:if you are modding your car then yes this is great keep it up. make it look pretty.