I'm not sure if anybody would be interested in this...but I thought it would be kind of cool. Depending on how many groups there are, for my example we'll say three groups.
So each driver in group 1 would pick a driver from group 2 and 3 to be part of their team, each driver in that team would use the same car as driver 1. You could have team testing sessions to help with driving lines, setups, etc. between races, and a constructors championship for the teams.
I just thought it would be a cool idea, and would be nice for some of the guys in groups two and three to get a chance to learn some stuff from group 1 drivers to become faster.
Thoughts?