Similar idea to T91683: Allow editors control of the page image in PageImages.
@Mooeypoo has some ideas for concrete implementation.
Maybe this should be content model based?
Yeah, if we implement this, individual content models would have to have their own way of specifying (or could choose not to allow specifying and just directly control it).
This seems to directly relate: T65792 (start displaying from point of anchor given, not just top of page, and allow this to work when on same page as anchor).
A decision is needed :)
What problem does this solve? It's not clear from the vague description.