I've been told that the e-brake is actually a small drum brake mechanism, and not part of the rear disk brake mechanism.
This makes sense, as my other car with rear disks has a separate caliper for the parking brake.
Assuming that I'm right about the small drum brake, then setting the e-brake will not adjust the rear calipers.
Regardless, I never use the e-brake, except once in a rare while when I want to leave the car running and exit the vehicle. Other than that I leave it (park it) in first. There's no need to apply un-needed effort (drum or not) to the rear disk assembly over an extended time. If the disk is really hot, then warping can be an issue.
Have Fun,
Randy R...