they should create a GS button for group solo switch and allow us to click off functions in a pop up on how it functions. Then say if I want a grouping of 10 or 20 tracks each with different sound sources that may or may not be midi based, could be audio or midi. If we could solo one track it should silence all the others in that group and not affect any of the other tracks outside the group.
 
Now that would be cool. also if we could create a virtual interface that would have 10 or 20 buttons ( act responsive and assignable) on it to quickly assign to tracks we wanted in the group and if there were rules for each button that could override the single channel rule so if I wanted to solo tracks 1 and 2 together that would be button one of the interface and then button 2 could be 3 or even 6 tracks and all the others in the grouping would remain silent when I pushed that button and then only the appropriate tracks would be heard in that group as I switched to another group of programmed tracks to solo etc. This would make sonar usable for live mixing so that we could record gigs. E drummers could use this to switch drum sounds on the fly like we guitarists switch presets on amps.
 
By the way 
 
I found a cool free midi plug in that will allow you to send a midi out to 3 different channels so you can layer 3 different drum programs together at the same time and you can do this for I think it will do 21 tracks. Have any of you guys tried it yet. its called note mapper http://www.vst4free.com/free_vst.php?plugin=NoteMapper&id=2169
 
Actually they have all kinds of midi plugins here http://www.codefn42.com/ was just reading about this last night but just clicked to go to the devs site just now. Man he has all kinds of stuff. http://www.codefn42.com/