KA,
My company has a small department too (2 pilots). I hold the role of safety dude, while the other guy holds the role of chief pilot dude. My job- maintain the manuals and various items that we use operationally (MEL, Flight Ops Manual, Emergency Response Guide). His job- take care of everything administrative that keeps the plane in the air (MX, Budget/Bills, Coordinating Schedules/Training, etc).
My primary function in this role has been to develop a response plan should there ever be an accident/incident and both of us are incapacitated. Since we are a flight department with only two pilots, there isn't anybody else in the company that has the knowledge of what to do if we don't arrive at our destination. I've been working with the company safety guy (the guy that handles OSHA and HAZMAT and other safety stuff for the entire company) to bring him up to speed on aviation related topics.
IMO, it's not a whole bunch of additional work or hassle. (I spend about an extra hour or two a week on the various projects.) I also have been able to score free magazine subscriptions to just about every aviation publication out there as a result of the title.