I run into some problems with the brush smoothing options in the latest Beta (perhaps it was there before). For one the value spectrum goes to 100, but already a a small value (20-30) the effect is very strong and creates quite severe lag. I know some lag is to be suspected with smoothing, and I know it from other apps, but Clip Studio works a bit differently in that I can set it to "adjust by speed". This means that the effect of stabilisation changes according to the speed I draw at. This makes it feel more natural and still controllable. Are you interested in implementing this as well?
Another more serious problem is that when I set a value of 50 or higher, it will sometimes result in a blob (one brush stamp) at the start of the line every time draw. It is doing so with some brushes not others, I have not been able to establish a pattern yet.