To answer the OP....
I think a healthy Romo we win the Atlanta, Saints, Bucs, Seahawks and the second Giants and Eagles games. So that's six games better right there. We'd have at least 10 w's right now.
I still think we would lose the New England and Carolina games, probably. That's not assured, at least against New England. Our D started out very good against them and I think with a real QB playing we would have put points on the board and that game could have gone either way.
Carolina I still think would have won but it wouldn't have been nearly as ugly had Romo been healthy all year, instead of coming in having played only once in 2 months.
The only games that I really wouldn't be sure would be a different outcome, w/l wise, is the Patriots, Panthers and Packers games. We could have still lost all 3 of those with a healthy Romo.
But we'd have been in them all, I believe.
I think we'd be at least 10-3 with a decent possibility of being as good as 12-1 but that would have been a real long shot having to have won 2 out of the 3 games here that I felt were by far the only ones that I could for sure mark down as losses.
Just seeing how close this team was in those other games that they lost, with really piss poor QB play, I think Romo definitely gets us those W's. In all those other losses competent QB play is all that separated us from a W.
These other three....ehhhh...much more of a toss up. Competent QB play may not have been enough to win those games. Definitely would have been better, closer, games but maybe still not enough.