Well I did it! With my Cubase SL, kontakt, only pedal up and release samples of the Emperor, and a non calibrated IR (ie a non piano specific IR), I obtained an emulation of pedal down.
See a quick made mp3 demo (no FX added) at http://jazzphoton.free.fr/Demos%20mp...kontakt+IR.mp3
I exagerated the use and non use of sustain pedal to really hear the differences. It's quite good, but I should spend more time to calibrate the IR and use a piano specific IR and the result should be better.
To do this (I'll try to translate in english as my Cubase SL is only FR), I assigned an IR (only wet) to send FX1 of the kontakt 1&2 channels, I created in "peripheric/peripheric settings" a "generic peripheric" and I assigned CC64 to Fader 1, and assigned Fader 1 to "VST mixer/kontakt1&2/sendFX1/volume" (I assigned the IR to send 1). So I created a realtime by sustain pedal controled send volume to the IR. And I can adjust the level of resonance by adjusting FX1 level.
What I really appreciate in this is that, as I have a continuous sustain pedal (not a switch on/off), a DP-8, I can really measure out in real time the sustain resonance as I want, when I want(I didn't did it in this mp3 demo), as it is on a real piano, to recreate living staccato lines (for example)
The advantage of GS3 to this soluce is that GS3 get all this in one software, but it's possible to get the same result by using various other ones.