Hey Ed this is a good idea and has it come about since the parade lap I wonder 😜
Many good Tuner should tailer the map to your specific car. I say this as each car is different due to age, mileage, maintenance history and even the way it's been driven.
Obviously the map increases bhp but it can also smoothen out the torque curve and potentially can increase mpg as the engine i less restricted. The drawback being it can wear an components out fast that may have already been on their way out if that makes sense.
Cant really comment on any tuning company myself as iv not used any.
Hipe iv helped :)
cheers
steve