Sticking in the A/P at 1000' aal and disengaging it at 1000'aal or less may work wonders for your MC skills during your MCC. Big picture, it achieves little as come any sim assessment
The purpose of an MCC course is
not to prepare you for a sim assessment. It is to train you in
non-technical skills applicable to the multi-crew environment. Hand flying should be limited to the minimum required to operate the aircraft in a simulated commercial air transport environment.