I was surprised with spot elevation functionalty in conjuction with floors. After selecting the floor spot elevations become active and one can change the value and this affects the elevation of a slab. Great.

I would love to have this functionality in case of modifying toposurface.
Spot elevation become active when one selects the toposurface (or spot eleavation). After entering the new value, topographic point is added to the toposurface without enetering the sketch mode.