What kind of Idle are you running at stop signs?

Keep in mind that the higher the idle in an automatic the higher the temp the converter generates.
(Like when sitting at a light in gear.)

One of my friend's had a cam so nasty the engine would not stay running below about 1,600 RPMs so he had to put it in neutral at stops or the trans would overheat.
The part that sucked was it barked the slicks when he put it back in gear and the cops would write him up for exhibition. :D
He got pulled over all the time for that, and he hadn't even started moving yet.