For those of us to mostly race single player; rather than always starting race from beginning, it would be so cool to enter a race midway from the pits to drive a stint (or stints). Imagine jumping in a Porsche RSR at Le Mans at 3:00am in 6th place and trying to make up a few places! These mid-race scenarios could be so much more interesting after the field has spread out and mixed-up vs always starting from the beginning when all the cars are bunched up. The AI tend to race better deeper into the laps anyway.