By mistake I trained drivers till they reach minimum health and the race was 8 hrs later. So I was left only with the choice to heal them using 10 tokens for each driver.
So I thought maybe there can be a feature where we can use less tokens to speed up the healing per hour of each driver for a specific period of time. I leave the values to the developers because it should not be better than the 10 token full heal option so that it is not misused or frequently used more than full heal.