Roland's new Pianostyle system works better than anything else I've played at following pretty normal piano playing, but yes, there's still a fair bit of adjusting you need to do to get accurate chord triggering.

Pianostyle USED to be simply that you needed THREE held notes before the chord would change, but the new system is, it takes three notes if you aren't holding the sustain, but if sustain is down, you need to actually PLAY five notes simultaneously, you can play anything up to four and the chord won't change.

So, play a big arpeggio on the piano with the sustain held down, the chord will not go crazy trying to follow...

Combine it with the Dynamic Arranger making the rhythm section follow your dynamics, and it's quite amazing how little you have to change to get a good result. But yes, you can't play ANYTHING and it figures it out, yet!