Maybe I should have said first "production road car". I don't know much about the RaceAbout apart from the fact it's from a small speciallist manufacturer but the other cars you mention are all "race" cars and so a considerable amount of flexibility in the set up of gearing, camber, damping, springing etc is to be expected. A production road car comes with fixed settings. There is no option to change any of these things on my SEAT Leon for example. If there were a Touring Car version of the Scirroco included in the game then that would be different. I would expect more flexibility of set up, but in a road car I expect next to none.
That would be their problem. The point of this sim is to recreate realistic driving under race conditions. That in itself should be all the fun people need, if it isn't then I would respectfully suggest they should be looking elsewhere for their "fun".
Blue = lights are on or off
Green = Pit line limiter
Yellow = Hazard/indicator lights
Edit: from what i know it is a new feature for the new patch because in patch Z the lights are in a different order but in 0.6A the lights are rearranged to handbrake, Not sure, rev limiter, lights, pit limiter, Hazard/indicator lights.
Edit 2: from what i can tell the xrr has an oil light warning so i am guessing it could be for that.