forgive me for not translating this but my foreign language is a bit rusty so i'll post this in english. :o)

fingertip controls?
sure the speeds can be adjusted

and sure the factory default service code is 55555...
BUT...
if the dealership followed the instructions in the service manual like they were supposed to this code would be invalid as it is supposed to be changed by the dealership when the truck is prepped before delivery.

But i believe the function to set is Aux 1 Max Spd Dir A or Aux 1 Max Spd Dir B
There is also Aux 2 speed settings for 4 or 5 function valves.
The speed configuration would be from 1 - 10 with 10 being the highest setting and 1 being the lowest.

Also take into consideration that some attachment mfg's put flow restrictors in their cylinder fittings to regulate the speed as well so there is a chance changing the speed on the lift function may or may not affect the attachment speed at all.