Hello,
I committed iteration 2 of the refactored Spray Tool UI (And did more clean up to the code) :
* The "Scatter" slider should now act as expected. (0 : concentrated, 50 : bell shape, 100 : almost uniform)

* It has been proposed to remove the current "Focus" slider. I personally find it interesting (artistically speaking). Its name is not very explicit and should be changed. I would like some people to test this parameter and then decide if we keep it or if we rename it.

The attached image illustrates these two parameters. Thank you for your feedback.

Happy new year !
Steren