I may not be the typical user but I often record a number of musicians at once with Cubase. One thing I have noticed is that many DAWs are now incorporating apps that allow each performer to control the level and makeup of their individual cue mix.
Maybe its very hard but seems like you are almost already there with ic pro and could accomplish this by allowing selection of a specific Cue Mix and use the faders to effect cue send levels by track going to that cue mix.
Fingers crossed I have been envying those with it for a year now.