Elaboration on support teams:
Support teams are not given access to secret forums. However, you may give them access to any other resources your teams uses, like chats and whiteboards (typewith.me, sync.in, piratepad.net, etc.). You are also not supposed to have them help the main team with deckbuilding, but the other way around is fine.
However, be warned that support team members are able to be taken by other teams as replacements, as per Section 3.4 of the rules.