Data AutoDisconnect Timer - Registry Setting?

[answerman]

OK, I feel like such a b00n for asking this. Believe me, I searched and found nothing. I've become kind of the de facto Apache/6700 guy over at the Alltel board on HowardForums, and the questions always seem to come to me there. Not that it bothers me except for when I don't know the answer... like on this one.

We all know that since AKU2.2 the data connection does not automatically disconnect after use (remember how it used to connect when you did a send/receive, do its thing, and then once the send/receive finished it would disconnect? Now, it stays connected for a while. How long? I don't know, since I have my reg hack in place to always stay connected to that screamin' Alltel EvDO.

However, someone over there asked me where the setting is that determines how long the data stays connected once it goes idle. He needs his phone to disconnect fairly often (let's say after 10 minutes of inactivity). Where would this be controlled? I dug through the registry and couldn't find anything. I assume that's where it would be (maybe in the same area as the AlwaysOn setting under HKLM/Comm/ConnMgr), but I can't find it.

Anyone?