Split and scroll addon

Hello everyone,
I am looking for addon which lets you split your view into two halves, lets you scroll like one big page.

I searched for something like that online but found nothing. In one of the blog post, someone recommended Tile Tabs but it didn’t work for me.

Since I was not able to find anything, I decided to create my own addon ( see video) which is incomplete right now.
I just want to ask whether, are there any solutions for my use-case as seen in the video which, as it happens, that I am not able to come across (I don’t want to work on something that already exist)?

BTW, If you ever felt the need to mark points in a page to get back to, you can get my this addon.

Thank you!