For what it's worth, I can comment on one of your symptoms: the loss of cruise control when you turn on a directional indicator.
I noticed the same symptom when my LF wheel hub speed sensor quit working. This is tied into the ABS system for braking and traction control, of course.
Disabling the ABS module by pulling its 10A fuse reverts to normal (pre-ABS) driver-controlled braking. This resulted in normal operation of the cruise control.
I'm not necessarily suggesting you settle for that permanently, but offering the observation as a trouble-shooting step.