After defining the third modification, Replicus went on to quickly brainstorm what special traits he could choose for all the modifications he had made. He couldn't wait and choose later, after all, Personal Configuration was to be done before evolution so that it didn't interfere with the form he would take on; some evolutionary options wouldn't fit with the configurations he had in mind.
His third modification was already underway and wasn't the kind that would interfere with how he looked, so it didn't count.
The first special trait he chose was for his extra arms.
He had the guidance field give them the option to freely move around every component of his body and not just be restricted to below his original set of arms. After the trait was granted, the switch to a different spot for each of the two arms was a lot smoother than Replicus had thought. It felt natural. His body didn't rearrange itself to accommodate these movements.