im actually going to agree with magic on this one for 2 reasons...
#1 its not a real series we're doing here, just the love of the sport. 2011 is where the seriousness comes into it.
#2 codemasters have confirmed that multiplayer results can be taken back into the single player game as some sort of "credits" system. If you go on a multiplayer race and win in a Red Bull, you'll get points, but if you go in a Hispania car and finish much further up the field than a Hispania car would be expected to finish, you'll get far greater amount of credits. For in single player mode, you'll be rewarded far more for finishing 5th in a Lotus than winning with a McLaren, etc...
The current system I had (if it wasnt explained properly, my fault) was the first two drivers signed to a team automatically become the two team drivers. Anybody who signs up to the team after become privateers.
Im still to hear on opinions on whether driver 3 & 4 should be given the privelidge of becoming a secondary team. What do people think?