Sadly the game does not support two race format with reverse grid as an option.
What more, we tried running the second race yesterday with a 10 min practice and no qual to have random grid, but once practice was over the server rolled over into a 5 minute qual that I had not set up. So we might have to run qual for both races.
That's a shame, still its not bad for an unfinished game..5 min qualy is almost one shot qualy, though you could probably squeeze two laps in so that could be interesting