If you want to include the spin up time there is a notes section attached to each motor model where you can record that. The models do simulate the effect you see on track with higher timing the motor just continues to spin up on long straights.

Once you have a motor model you can assign it to a car and use the acceleration page to look at how acceleration, speed, RPM, motor current are effected by gearing and motor timing. Some interesting stuff here. Great for comparative tests.