You can drive with the e-brake disconnected. Just don't pull up the handle. On the backside of the calipers are where the cables attach.You'll see the metal cable and the "nub" resting in the arm. You just gotta unhook the ends really. If they are tight, they you know for sure the ebrake is dragging.
The e-brake light is a dual purpose light. It comes on if your brake fluid is low and it comes on if you pull up on the e-brake handle. The light only comes on if the handle gets pulled up.
The Baer kit pulls the calipers further away, so it's sorta like slightly pulling the e0brake. Several guys have reported this problem and said that over time the cable stretches and "fixes" itself. However if you ever go back to normal GT brakes the cables are useless and need to be replaced from being stretched.
I think the Baer kit is more trouble than it's worth honestly