Landscape Paint Height Restrictions

For the landscape painting tool can we please get a simple restriction tool implemented.
Ideally what I would like is 2 values for minimum and maximum height (in the window with the brush settings) and a toggle value for on and off.

If I set minimum to 0 and maximum to 1000, it would just paint my landscape between 0 and 1000. It would be great if it could be toggled on and off with another setting. This way I can paint with and without it.