a) I haven't tried, but I guess the status bar fix should be the same as in Sparrow 2.0! Have you tried that? (App-Info.plist -> View controller-based status bar appearance - NO)
b) Sparrow 2.0 has a different startup-code than Sparrow 1.0 -- e.g. your root class is no longer extending "SPStage", but "SPSprite"; and there's no "SPView" but a new "SPViewController" instead.
To upgrade, I recommend you start with the new Scaffold project to see how the new structure works, and integrate your game code there. That will be easier as converting your old project.
Otherwise, if there's no specific feature you need, you can also stick with Sparrow 1.x for that game, and upgrade only with your next.