Erase terrain brush "power" option

All the terrain brushes have an "opacity"/"power" option allowing to paint more subtle roads, highlight some small cliffs.
But in case of a mistake, the erase brush completely clears the terrain paint, and does not permit you to make a path that was too noticeable less obvious without undoing your paint or erasing a section of it and reselecting the paint at a lower power.
Adding a power option to the terrain brush eraser would simplify the process.