Terrain Builder and Buldozer would really benefit from a smooth-brush for realtime smoothing of terrain edited with the level/raise/lower/set-brush directly.
In the current workflow, one must select and smooth terrain in the terrain builder window after changing the terrain in buldozer. That is very unintuitive and especially problematic for large non rectangular areas like roads.
Realtime smoothing like in all other terrain tools like L3DT or Wilbur would be a great addition.