I can understand why they made it like this. It would be really difficult to control the length if the whole pitch is available to us. The timing for this would need to be very very precise!!
Maybe in future they can add a button for choosing the whole pitch along with the pre-determined length areas!! This would also cater to the risk vs reward approach, as choosing the whole pitch does provide the flexibility of altering the length whenever you wish to, but with the increased difficulty, it would be much more difficult to hit that length perfectly!! This would obviously be used by PROs as it would be pretty difficult to control the lenght, however it would take the difficulty level to a totally different level
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What do you think Ross / Mike????