For 3D object deformation: could be cool to replacing planes (Like landscape editor) by any other 3D object like sphere for planets, cubes for alien structures or cylinders, etc),:
For procedural noise generation in the 3d object (Deformed or created in the previous step) could be included a additive heightfield blending method using procedural controls to generate fractal noise effects as tileable seamless gray-scale material for scattering perturbation effects, like: Erosion Effects (Diffusive, Thermal, Glaciation, Wind, Alluvium, Fluvial, River Valley) and Global Effects (Grit, Peaks, Plateaus, Terraces, Cracks, Craters) and Slots for imported textures
And maybe slots to add material including normal and POM (like simple texture or procedurally generated), for manual painting and/or dynamic blending in the object generated in previous step considering terrain slope, cavity, AO and heightfield.
But I think this goes way beyond Vertex Painter, but that’s the idea and the feedback. Thank you for reading:)