Pitvoice

You can use this in two ways:
1) Manually request what pitstop consists by select checkboxes on PitVoice app
2) Push the hotkey and start talking: "box, supersoft, 3 liters, repair body" or "pit voice, soft tyres and 5 litres of fuel" or just "soft, body, 7 liters"

by Marocco2