As well as holding the same Limb Animation rollout as the rest of the limb the Palm has its own, unique functionality. These include the Digit Manager and the Palm Animation rollout. The same controls are available for ankles.
The Palm Animation rollout comprises a single slider called Target Align.
E.g. of palm not inheriting IK target rotations
When the Target Align value is set to 1.0 the palm inherits both positions and rotations from the IK target.
E.g. of palm inheriting IK target rotations
Digit controls include a digit manager with advanced digit modifiers.