I’ve asked for that before. That is not a real change in Sketchup but imho a simple change in LO. I actually think the reference to scene axis is handy, but I do think there should also be possible to establish a value to subtract or add to the X, Y or Z coordinates of a point. I also think any on face point could be trated as a vertex when you reference it in layout so that we can get the levels of an horizontal slab, for instance, by picking any of it’s points and not having to search for a specific endpoint or edge.
Take a look here: