I think it would be beneficial to be able to edit the slope of a split line within a shape edited element (in addition to editing it's elevation as we can currently).
I'd picture a feature like this involving two listening dimensions at either end of the split line when selected expressing the slope away from that point. See crude simulation below:

You could click one of these, change the slope to 1:100 and that vertex would raise up accordingly.
I currently achieve this with generic annotations in plan but involves a lot of copying values backwards and forwards. Would love to just be able to do it like this instead.