I just learned something new. I called CBOT again: The grain options do trade electronically AT NIGHT. From 6:30 pm Central to 6 AM. Normally there's not much liquidity in the electronic sessioin, but he said that some nights the liquidity is decent, especially between the hours of 6:30 pm and about 9 pm. During the day (pit) session some locals will enter a bid/ask electronically which some services like Esignal can pick up. So you will see a bid/ask on eCBOT during the day, but it's not tradable electronically during the day.