No. There are no nodes. You assign two collections in a sidebar panel, set a few sliders, and click scatter. Everything is standard Blender fields and buttons.

Each instance shares its source mesh data, so scattering does not create new meshes. A large scatter stays far lighter than duplicating objects the normal way. There is also a hard cap of 50000 instances so a wrong density value cannot lock Blender.

Click Prepare Tree Pivots once. It moves each source object's origin to the bottom center of its bounding box so instances sit flat on the surface. The visible geometry does not move. Run it again whenever you add new objects to the collection.

Yes. Click Create/Enter Weight Paint, then paint the areas you want clear in black. Scatter again and no instances land there. If painting the clear zones is slower than painting the growth zones, paint the growth zones white and turn on Invert Mask.

Yes. Placement is calculated against the evaluated terrain, so trees and rocks land on the final displaced and subdivided surface. The density mask still reads correctly because it samples the original mesh.

Yes. The Trees and Rocks channels are just two independent scatter passes. Put any mesh objects in a collection and they scatter the same way. Debris, mushrooms, crystals, grass clumps, small props all work.

Use Clear Trees, Clear Rocks, or Clear All Generated. It removes only the objects the addon created. Your source meshes and terrain are never touched. Then adjust settings or the seed and scatter again.