Working on a string quartet presently and come to think of how nice it would be to have left hand pizzicato for solo strings. Not at all that uncommon, I think, at least not for violin/viola.
And if guitar is going to be included in GPOA, also having the possibility to chose an open string instead of a stopped note would be nice. Maybe by a MIDI control?
This would of course be very nice to have for all strings but I think it's very important for a realistic guitar sound.
I think it's because most of the decisions for instruments have been made for gpoa, and this kind of stuff is kinda esoteric, so it won't make it into something like gpoa right now... Plus, I gotta tell you, if you write a string quartet and use any pizzicato, it's gonna sound the same to the people listening.... So, it's like a place marker for the real performance...