The ability to specify the currency of a specific expense (service, insurance, transport, …) than the “main” currency of a car.
Say you purchase a car in GBP, then import it into the EU and pay for other expenses in EUR. Then later on move to Switzerland and now you have expenses in CHF. It’s a bit of an extreme example, but it would be great if this could be accomodated.
As a cherry on the cake: Make foreign-exchange calculations back to the original currency of the car, while taking into account the exchange rate of the day of the expense.