The problem is that this would need a separate implementation for every supported page, because every manga reader is different. This is not only a lot of work, it is difficult to maintain too, as every time the page changes something it breaks the implementation.

We can do this for video player as they are standardized and all work with the same code.

The best solution we have is to set the Manga sync mode to instant and just add an update delay. So if you are longer than lets say 2 minutes on a chapter it updates.