I would love to hear more jazz and big band articulations in the clarinet, trombone and any others lacking such things - for example falls at the end of the note which I have only discovered in the Trumpet a3 (though there may be more I've missed). These provided in single instruments and ensembles would be very cool.
Also, an 'A Clarinet' which just has that extra depth of tone, and is used so regularly in the orchestra. We clarinettists have pairs, not singles!
For that extra sense of realism, a full set of sneezes, coughs, splutters, watch bleeps, whispers and wrapper rustlings would be really cool - then you might try and pass off recordings as live!
Nick