"""""""""""""Is it possible to add 'Proportional Editing' for Surface's Control Points like the one in Blender? If so, then organic surface creations / explorations will be greatly improved """"""""""""

For "Exploration", most people are overlooking MoI's "History Enabled" tools.

So you generate your object or surface from Curves. Then "Edit the curves" to get your "Proportional Editing". I can make a video exactly as you show by doing it that way.

It's just not on imported or previously edited object where that initial history is broken. Just for "Exploring"!