I have the Grand Piano rack on my Ableton Live presets and one thing that I tend to have to turn off because it bugs me is the 'hammer lifting on note release' channel within the rack. What happens is that there are two parallel channels, one triggering the piano tones in a Simpler, and one that has the "Note Length" effect, except set for Release, which triggers a soft 'thud' when you raise your hand off a key.
I was playing with kind of a twangy Operator sound and the Note Length effect and really liked the sound I got when I lifted my hands off the keys when I had it set to Trigger on Release. The problem was, that now I don't have anything being triggered when I hit the note down. So I hit Ctrl G to group it into a MIDI rack (not instrument), and made another channel with note length, except it acts normal. So now, when I hit a chord, it bangs out all the notes, and then when I lift my fingers off all the keys, it does it again (I had Release set for a very short time), and feels like i'm just striking the strings lightly as I'm about to hit them again. It isn't all that authentic, but feels reeeeally fun to play around with for a couple seconds. haha
Its like having your feet stuck in hot tar
Edit: not to be used with the strumming arp, as this aims for a different kind of sound.