Scrolling window while key is held down

Is there any way to scroll window while mouse button is held down?

I’m working on timeline based article page. On the left side of the article there is a widget (Articles Navi Widget) that tells the user which part of the story he’s currently reading & also enables to naviagte through the page. It should work like this - user can drag the dates (I called it ‘Widget Knob’) up or down and while the knob is being held the window scrolls up or down. Most preferably I’d like it to scroll with the speed based on how far the knob was dragged on the Y axis.

https://h8yqjt.axshare.com timie_line_produkt.rp (84.9 KB)