On website wallpapers mouse wheel and mouse drag don't work

I use Lively Wallpaper to integrate a Website on my desktop. The website contains a scroll bar. When I open the webpage in my Internet Browser, I can scroll down by using the mouse wheel or by dragging the scroll bar with the mouse. When I use the webpage as a wallpaper with Lively, however, the mouse wheel and dragging don't work. I can still scroll by clicking on the scroll bar, but it is less convenient. I tried different webpages, which all reproduce the same behavior.

As Mouse Click and Mouse Hover work, maybe it is not too difficult to make Mouse Wheel and Mouse Drag work as well?

I am using the newest version installed from github.