Command on what? They aren't going to let you near the Twotter until you've got 500 multi command, and that would be on bongo's. And as far a multi-crew, it's only 2 crew cos there are either more than 15 pax with no cabin attendant or the aircraft is IFR without an autopilot. So you are not an essential crew member, as the aircraft was Certified for single pilot operations...