Of course it doesn't affect the sound (much...I suppose the subtle sound could actually be modelled...), so probably pretty low priority! The "soft pedal" shifting the keys the wrong direction actually bothers me a little more, but again, low priority.

I find the bounce fairly realistic when playing forte and staccato at the same time, but of course when you let off slowly and play more quietly, piano keys don't really bounce.

That is indeed true for short staccato notes. But if you play forte and keep the note (sustain) for a bit, the bounce should be just as smooth as when you play soft I think, or not? That was the part that didn't sit quite right to me. It's just a minutiae, I know...