Did not know ublock has these features. I will have a closer look at it.

For now: Blocking video or audio is not planned for "large image blocker" since there are a lot of "click to play"-solutions out there that do a better job. (For me the "NoScript"-addon stops audio and video objects.)
There could be some awkward behaviour like stopping the video while watching in case a follow-up part of the video-stream exceeds the maximum size. I will experiment a bit with that and will try to make progress to implement some of the ublock features. But it will take some time.

Regards
Kai