a google search brings up quite a lot , it seems it is definitely a thing even for my box without the paddles !
Gearbox TCU remapping offers the following additional benefits over and above our engine ecu remapping:
>> Additional power and torque by relaxing the gearbox torque limiters.
>> Lightening quick gear shifts along with smoother gear shifting.
>> Faster reaction to tiptronic or paddle shift inputs (where fitted).
>> Improved low speed and off the line response through earlier torque convertor locking.
>> Increased fuel efficiency on some transmissions due to less power loss through the drivetrain.