This is peculiar. I have just started using lightroom3 and was able to import RAW and separate jpg files from the same folder with separate little pics across the bottom. Today I am having a problem.
I tried to import a folder with both RAW and jpg images. They have the same names but different file extensions CR2 and jpg. CR2 imports but the jpg does not. Interesting addition to this is that I went
to a previously imported folder and opened it and both sets of images were visible. What the heck happened? I support your position in that both sets of images should show up.