Hi, Fredo,
You probably have it on your to-do list already, but remembering and revoking lastly used soft-selection radius would be a great improvement. Now it jumps back to zero when the tool is activated again (and when it was used previously with larger radius). For comparison, Blender always remembers the last value for proportional editing.
Great tool, though. I've been asking ThomThom for years to expand his Vertex Tools with more falloff options, and here we are with FredoSketch!