Option to show labels on all but first in a group

With programs like Outlook, I couldn't care less about the label on the main window (it says 'Inbox - Microsoft Outlook'.. I'd like that to have it's label hidden. But I do want to show the labels for other windows in the group.. those have email subjects, or meeting titles in them.

It'd be nice if we could have a new option in the Taskbar Inspector, that said

'Show Labels: ' -> Always, Never, All but first