First of all, great work you are making here! Congrats. I am a huge fan.
To have a more custom control over density it would help (me) to have a percentage factor associated with
the “pick an area” and “add a paint area” tools. Both to add and subtract…
For the fallout, it would be nice to control density at the beginning of the distance (border) and at the end of the distance ( of the fallout), to be able to have other density than 100% while using grid distribution.