Can't save smoothing as a brush setting?

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Hi! I can’t seem to be able to save the smoothing of a brush, usually shown in the “Freehand Drawing” menu, as an actual brush setting? I require a much higher smoothing amount than most due to issues with shaky hands, and having to reset it each time I switch back from erasing (since I click the same brush to reset the opacity to it’s original, I use 100% opacity for erasing) is a bit tedious. But I can’t seem to find a way to save the smoothing as a setting when I go into the brush settings. Am I missing something here? Is it named differently than it is in the “Freehand Drawing” tab?

TL;DR - I can edit the smoothing in the “Freehand Drawing” tab, but when I go into the brush settings, I can’t figure out what to edit in order to make it permanent.

Basic System Details

MyPaint version: 2.0.0+git.af5225a2

Operating System + Version: Windows 10 Pro, Build 18363

Make and Model # of Graphic Tablet: Wacom Bamboo Fun CTE-450

The name of the setting is: “Slow position tracking”, under the “Tracking” tab. This information should probably be added in a tooltip to that slider/label.