Jake -
I have had the CI Tools Wall Framing add-on for many years and have developed some presets that address the North American standards. If you would like to see these send me a private message.
Chad Conrad, AIA
AC8.1 - AC21, EcoDesigner Star, MEP Modeler, CADImage Tools (various), Artlantis 5 Studio
15" MBP OSX 10.6+, iMAC OSX 10.6+