I think roles are a bit of grey area since it's not really reasonable to expect everyone who buys a Core to check online for the official ones. I mean is there even anything in the Core box the says there are Clan specific roles and where to look them up?
Although if you want to get technical the Learn To Play document say the deck construction rules are only for sanctioned tournaments. So if you're going to follow them anyway you might as well use the proper role. Otherwise, sky's the limit; use 2 Strongholds and 3 roles with a conflict deck of twenty cards and a dynasty deck of 53.