I've been suggesting that for ages. They could be trained the same as drivers, instead of
Driver Abilty/attacking/defending etc
Mental/Focus/Morale etc.
It could be
Pit Crew/Front Jack/Rear Left ect
Equipment/Front Jack/Rear Jack etc
So whereas with drivers you train 1 of 4 areas in each section, with the pit crew, you could train the crew but also you could "train" the equipment so that instead of a pit crew member getting better, a piece of equipment improved.