Planning the route, organising Dip Clearances, generating your own flightplan, organising your own ground handling, to name just a few that the average airline jock doesn't do.
What the hell are all the lazy OPSOs doing if that is being done by the crew! I thought the mustering was created specifically for that kind of crap. I know one and he keeps banging on about all the important stuff he does and the pilots do bugger all.