I want to render the back buffer to another texture (performing scaling and other operations). If the back buffer wasn't created with the D3D10_BIND_SHADER_RESOURCE flag, is my only option then to create an intermediate texture (where I *do* set D3D10_BIND_SHADER_RESOURCE), use CopyResource() to copy the back buffer to the intermediate texture, and then bind the intermediate texture for rendering to my render target texture?

Yes, as far as I know copying is the only solution here.