Return to center should purely be a function of your (in question) alignment and freedom of movement of ball joints and tie rods.
I guess I should clarify a little bit. Over-boosted steering due to a failed or unplugged column sensor won't completely prevent the wheel from returning to center, but it can slow the process to a point where it feels "off" especially at certain speeds. For example making a slow 90 degree turn at 10-15MPH you may have to help it back to center a little.