This is one of the function available on midi maping setup

FX2 - 1 SelectUp 

i have assigned that to one of the buttons on DDJ1000

can great team of programers add extra function with name

FX2 - 1 SelectDown

that i can use to avoid pressing 21 times to scroll through the whole list of effects to the desired effect if the desired on is one position below currently selected one

DDJ 1000

Please