I encourage anyone willing to fiddle with those Temporal AA settings to do so. I've been trying to get something good, but it feels like you need to hit some kind of balance between things that change how long the ghosting stays on screen, how much ghosting happens with slower movements, and how stippley things get in movement. This is such a garbage AA solution.
...That said, I think I've improved on it fairly dramatically, getting close to that sweet spot..
Code:
[SystemSettings]
r.PostProcessAAQuality=6
r.TemporalAASamples=16
r.TemporalAACurrentFrameWeight=0.45
r.TemporalAAFilterSize=0.5
r.TemporalAASharpness=0.5
r.Tonemapper.Sharpen=0.5