After reading all the posts in this thread and a few others I am under the impression that there is no bluetooth wireless headset that has a PTT button on it. Am I correct or does someone know of one?

I'd like to be able to keep my phone in it's holster most of the time and when I recieve a DC from someone just depress a button on the outside of my headset to respond. Sounds kind of treky like but I think it would be so nice to have something that did this. Why don't vendors think of this stuff?