1) Yes, that tracker
2) No, not the [ + ]. See the image.
Whatever watch you have selected will be shown in the panel on the right.
3)
Multiple watches Window. Yea, probably not.
You can always have
- one value in the "evaluate modify" window
- one value in the "detail pane" (the panel on the right, in the attached image)
- one value in the "debug inspector"
- and if it is a local var, you also have the "locals" window.
Eventually there may be an API to register your own additions to the debugger... But that is still far far away.