Range = in qualifying or race, if the driver has a high range, he can be anything from amazing to rubbish. Schumi has a low range cos he is consistently the fastest, or very quick.
It all depends on their original skill level in gp3edit. eg if they had a skill level of 11 000, then a range of 500, they could be anywhere between 10 500 and 11500 skill.
In Gp3, go into workshop, wher you can change to kph.
To get more people qualifying at once, or even the 1 lap qualifying of this season, go into gp3 folder, then gpxpatch folder, then gpxdata. In the gpx ini files, maybe gpxsat, i don't know, there is the option of 'cosecutive cars' change from 1 to 4. Thhen change number of qualifying laps to 3, and in game, set qualifying period to the full hour, otherwise not everyone can qualify in time.
Hope that helps!
-----------------
She says brief things, her love’s a pony
My love’s subliminal