Terrain should overall get a revamp, but there is this feature that might be useful: Smooth Terrain Heightmap/Colormap Importer Release!
You can create a height/color map via an image and Roblox will make the terrain based off of that.
You can also manually change the pressure of Terrain in the Terrain editor, but something like pressure sensitivity with something like a Wacom tablet isn’t a thing I don’t think.