Pageup and pagedown to scroll quicklook panel

[M0rtenB]

When I use the quicklook/preview functionality in the opposite panel, it would be nice if pageup and pagedown were temporarily remapped to scroll the preview window, i.e. to navigate the pages of a multipage pdf. This is similar to how it works with quicklook in Finder and Alfred.

[mikekazakov]

Please take a look at F.A.Q.: #136.
I'm not aware of a way to implement it, but any suggestions or tips would be welcome.