Please, do this possible!
I hate the Brush Pluck! Most of the times I don't have room enough on my Screen in order to get the desired size or opacity.
BESIDES! Sometimes if I hide the UI when I change the size or the opacity of my brush, there's no blue rectangle thingy telling me the actual size of the brush or the opacity percentage.
This is until I click on the Lagoon to turn on the UI, and then turning it off again to make that blue thingy appear again.
Using Sliders will solve this problem!
I've created with Inkscape a Slider concept of how you could implement it on Sketchbook:
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