Idea For Zoom Bar Hack or App

[mikenerd]

I am wondering if the zoom bar could be enabled to give us back up and down from the D-PAD in apps that dont use the zoom bar. so, in say file explorer if you were to go from left to right on the zoom bar it would scroll down and then right to left would scroll up. I dont know any programming so I am just throwing this one out there. If this already exists. please let me know what its called. Thanks