Say keys 1 and 2 for instance for a 2 car league, and just 1 for a 1 car league. Might be handy when you're in traffic to be able to kers both cars at once, and arguably just easier in general than clicking the kers button individually for each driver xD
I asked for the same thing over a year ago about having kers for both cars at same time, it would be good to control both kers at same time, i also said about having 2nd box on that thread for both cars tyres but dont need that now as u can see both on timing.
But id still like double kers button or hot key tho.