A Lonely Job Communications is a difficult position to play because, like Engineering, you're burried in a hole with no view out. If you don't have a view of the main screen I highly recommend either running two PCs or running two displays (see my earlier tips on running two copies of Artemis). Being able to have an outside view helps keep you from feeling totally isolated.
Stealing A Peak I highly recommend sharing the Science view. You have to be carefull not to get in the Science Officer's way though, just use the screen to see the information available, otherwise the Science officer might have a few words for you that won't come over the comms.
Vital Tasks Getting damaged enemy ships to surrender can really help, but the most fascinating options for the comm officer are to bait enemy ships away from a vulnerable civilian ship or starbase. It's even worth doing when you're in bad shape, just because you're off recharing at a Starbase doesn't mean your job is done. And on that topic radioing in before docking helps, though not as much as delaying docking until within 100 clicks.
Brain Dead Allies Finally I highly recommend aggressively directing any frigates and escorts to protect starbases. In conjuction with a base they have a chance to make a real difference. Likewise directing Civilian starships away from trouble is critical. Never assume a Civilian or Military starship is smart enough to avoid a minefield, they just love to play chicken with mines.