Every time I learn something new about rhino, I try to share it here. I may be late to the party, but I was today years old when I learned how to tab windows in rhino for mac.
see below-
in v7, you can get tabbed views in rhino if you go to system settings> desktop and dock- change the windows and apps section to prefer tabs when opening documents always
then go into rhino and go to settings>general > tabbed windows> merge all windows into one window
now in rhino when you open a window, then open a 2nd window, it should tab those windows into one window. In v7 you have to show the tab bar from view>show tab bar
in v8, if you set the apple os setting rhino does this automatically.
hope that helps… we both learned something today!
happy modeling
-Kyle