A real "headphone" output
Using PlayIt Live in a "simple" mode when the audience output is a mix made in PlayIt Live it would be good to have an output that is the "main" (including any microphone mix) unless a track is cued, in which case it is the cue output. This is often how a physical mixer will work, where headphones are "main" unless "PFL" is pressed on a channel.
It would suit the more common two stereo channel sound cards as they often have one headphone capable output and one for a mixer on phonos.
If it even allowed the "main" fed to the headphone output to be a "re entrant" to the computer (post external mixer) source then more or less any mixer would be usable for web streaming or similar applications.
A level control on this "headphone" output would also be handy.