1. Yaw damper will be positioned in the yaw control run.. Don't know where because never done a type course on a DC10/MD-11. Y
2. Split rudder with two parts per section. Increased rudder T/E displacement to counter loss of area due to an engine being fitted in the vertical stabilizer. Split design allows redundancy if a hyd system to a pcu fails.
3. You do not use trim tabs on fully powered controls, apart as an emergency power off feature on some types.