Unable to scroll when loading segmentation

I see that users loading segmentations without the corresponding image volume get confused, because it is impossible to scroll through the segmentation volume. Is there a good reason to have this behavior?

Probably because segmentations are not being taken into account when determining the extent/spacing of the slice view UI (e.g. the slider and the scroll wheel). Probably would be best to generalize the slice viewers so that any displayable node in the slice view can report a preferred bounds and spacing and not just volumes.