Quick updates :
1 : Add a selection of objects in the list instead of having to pick them one by one.
2 : You can undo (Ctrl+Z) what you just have painted after exit the painting tool (right click or escape).
The result of two days of experiments around MouseTools.
You can use it to paint and distribute objects (copy or instances) on the grid or on surfaces. With Random controls, collisions detection, attachment surface...
You can paint all the max objects (geometries, helpers, proxies...)