I believe this is a limitation of any sample-based synthesis, like AWM. The only way to really get around it is to abandon samples and go for physical modeling from the ground up. The Pianoteq software ($150) has some great physically modeled EPs. They even have a version that can run on a Raspberry Pi (ARM Linux), so you don't need to lug around a laptop to use it.

Sustain is suppose to hold the previous notes same as SSS but I wonder somewhere internally can the function be set to re-trigger with consecutive strikes depending on the way you want to replicate the instrument. Having it re-trigger negates the purpose of the sustain so it's selective sustain. Chorusing effect is cool too. Different doesn't necessarily mean better or worse. I'm not sure I could tell the difference.

Other sample-based keyboard I have...a Casio PX 5s and a Nord Electro 4 do not do this. If you re-strike a sustained note it seems to terminate the previous instance. I noticed it on the YC playing the song “James” by Billy Joel. There are points where you sustain a chord and follow it with a scale. The notes in the chord jumped out in the scale with the chorusing and a little louder volume. That caused me to figure out why. You’re right though...not many people would notice. It’s a minor thing...was just asking the question to confirm this is the way the keyboard is designed. Hopefully Bad Mister or Blake can confirm. BTW a real Rhodes which I had for year reacts even differently. If you re-strike a sustained note it sometimes chokes it off. I’ve never heard a sampled or modeled version copy that result...and I’m glad. It bothered me on the real thing.