QOL - Better level terrain control

The brush size, and pressure is very large/strong at the lowest setting.
Add better control and wider range in both - preferably with some different shapes of brushes.

Also - slopes - let me set a high point and a low point in the terrain and have the brush create a smooth slope between the two.

Lastly - fix the bug when you use the smooth tool towards the edges of the map. I t automatically finds the low point of the map edge and starts creating a hole. Keep it at level with the actual terrain height.