You should be able to edit an element's metrics directly in the Metrics pane. Firebug does this by letting you double-click on any of the numbers in the Metrics pane.
<rdar://problem/5732818>
Created attachment 22906 [details] Proposed patch
Comment on attachment 22906 [details] Proposed patch does editingCancelled need a context?
(In reply to comment #3) > (From update of attachment 22906 [details] [edit]) > does editingCancelled need a context? > The shared editing code calls editingCancelled and passes a context. We don't use it, but it is always passed to us.
Landed fix in r35876.