If it's a random roster base commuting will be a nightmare. Expect 5-2-5-2-5-1-2-1 or something equally as grim and you won't have any idea what your roster is until of the month. Get used to saying 'I'll let you know on the seventeenth' many times a month every time you get invited to pretty much anything.
The commuter scheme allows free travel in uniform when staff travel is not available six hours before departures. Many crew misunderstand the commuter scheme and make is clear they're not happy you're there as it's because of you there's no staff travel (little do they know).