Pianoteq as Sound Design Tool

So.... Pianoteq has super great sound design features already, but they are all intended to more or less stick to a physical piano model, or to "reality", respectively.

Recently I found myself switching to a Kontakt piano only because I wanted to have a really slow artificial attack of about 500ms or more. Pianoteq doesn't offer this.

How about an addon for sound designers that allows for more "unphysical" cool stuff like attack design and so on? Values high as crazy for sympathetic resonance, really high values for direct sound duration in connection with differing strike points (leads to very cool resonance progression)?  Something to be creative for sounddesigners and leave the real piano terrain?