Give Head of Personnel a medal box similar to that of the Captain or Head of Security. It would contain medals that award service and cargo for a job well done. Did the chef set up a classy restaurant with themed food and decor? Give him the Master Chef medal! Did the janitor keep the station spotless in a particularly bloody round? Give him the Santitation Hero medal! Did the clown actually have a funny gimmick? Give him the Barrel of Laughs medal! There could be a medal or two for each job nominally under the HoP in the chain of command. Including assistants, even.
This addition would have a twofold effect. Not only would it encourage HoPs to get involved with the day to day affairs of the station, it would also give more opportunities for players outside of security, science and engineering to be recognized for their creativity and hard work.
I dream that one day, the HoP could actually begin coordinating fun projects, with medals waiting for the crewmembers who offer up their time to help out.