+1
But I want to add yet another "fairly specific" wish (I do not see anything one user specific in previous posts... but since Craig think so...

)
I guess many "home users" have limited number of analog and MIDI inputs. And so I wish the third "mode" for Exclusive Record Arm (in addition to On and Off): Input Exclusive Record Arm.
Except for doubling VSTi, it make no big sense to record the same input on more than 1 track. At the same time different inputs to different tracks can be desired. F.e. I have my DP and 2x audio interface. For my n00b needs I sometimes record Mic input with DP (MIDI) in parallel (or Mic with Guitar in parallel). What I have never done so far is recording (the same) Mic into 2 (or more) tracks in parallel. I mean I would prefer to replace "Non exclusive record Arm" (how it currently works) with "Input exclusive". And have "Absolute exclusive" in addition.
Well... I know how to make it work that way without Sonar modification