In case of good PCB layout there is a very small chance you will need filtering level more than LOW. My observations is that HIGH level completely remove bouncing of cheap chinese potentiometers connected to bluepill board, but yes - you can feel the input lag a little. Input lag at MEDIUM level is nearly unnoticable.
Keep in mind that transient response test show you 0.2s lag for immediate fullscale change at input - in real cases it is much softer. Best advice I can give you - just try it :)
Now I am working at v1.3.5, it will contain 7 levels of filtration and dynamic deadband. I already implemented test version of it and it works pretty well.
I also ordered MCP320x parts from China to make comparison with internal ADCs and maybe add their support to the firmware. But shipping may take a long time for some reasons...