[Tim Wood]

Yes, this is a bug (scheduled for 1.0 right now). <bug://bugs/43094> (Selecting the inbox in the sidebar and pressing return creates a new project, not an inbox item)

Switching the focus to the content outline seems reasonable, though it will be a little less necessary once this bug is fixed. I'll write it up -- one problem is what we would select in the content outline if we made it the focus. You might be going to the inbox to add a new item (in which case selecting the last item would make sense) or to process it (in which case the first item).