A multitasking enabled user interface would be so nice!
For example, while pausing the game in an A-spec race, I could press the triangle button to pop up the multitask menu à la iPhone, choose to go back to main menu, start a B-spec race that I could keep running (provided my B-spec driver does well alone), while doing some maintenance on my cars (oils change, paint some wheels...). And if I still cannot make up my mind on which blue shade to choose for my car, I could jump back to my A-spec course while having a different car waiting in to be customized in my garage...
With a multitask friendly game, I could easily change my setting while getting ready for several events at the same time. Wouldn't it be good to easily switch between Special events and A-spec seasonal events with the car properly set (PP, tires, paint and all) and ready to roll without waiting?
Just a thought...