The credit covers any composite wood products inside the "waterproofing system," so that would clearly cover the engineered framing products you mention. I-beams are even specifically mentioned in the reference guide (for NC v2.2 as well as NC 2009), so we also list them in the credit guidance above.
Any additional questions about this? I am also checking to see if we can list more framing products from our GreenSpec directory in the sidebar to the right.