It doesn't give you everything on the same screen but if you can't live without the automated filtering of a tabbed inbox, try the "Quick links" Gmail lab rather than multiple inboxes for fast access to Needs Action / Awating Reply (essentially you can save searches to the stars which appear as a set of links below your categories on the left).
The step-by-step eventually mentions this, but until you get to that point you won't see any sign of the multiple inbox UI.