I'm sure that's not all a good simdriver should have but it's a comprehensive range of abilities which, trained, can improve the value of the simdriver. In simracing though, similar knowledge increases efficiency of the process of setuping the car. In real racing there are teams and bunch of engineers around one driver.
Racing knowledge - this is knowledge which includes all the stuff related to how to drive fast, safely, etc.
Often drivers (I also have this problem), when an accident or something unusual happened in front of them, have a tendency to focus on the object of the accident thus they usually lose the apex or spin the car, i.e. When an accident happened in front of you and you are in the middle of the turn, this ability helps you to figure out the correct path in order to avoid the accident. This is the ability to notice things which appear beyond the place we are currently looking at. Peripheral vision - very important in both real racing and simracing.Forwarding info to engineers - the more you can tell you engineers about the car the better and more efficient the work on setuping the car.Sometimes, especially when tyres are very important, altering the driving style and thus tyres' degradation is very important. Control over own performance - it's an ability to control the speed on the track.predict approximate time for pitting etc.). During races it facilitate engineer's work, for example helps make a proper decision in the strategy (e.g. It helps in making correct decisions in setuping the car. Consistency in lap times - also very important ability for a driver.Without a doubt this ability is directly related with patience, anticipation and coolness. Often when in a battle there is 3 or more cars involved, lack of responsibility caused by lack of g-forces, adrenaline and other factors which appear in real life, occurs and we have a "beautiful" (read pathetic) accident. The driver has to know what he should and shouldn't do in traffic.
In such a situation the engineer comes in handy. Then our concentration goes lower and thus we are more susceptible to make an unnecessary mistake.
I would like to present my thoughst about good simdriver's abilities.