That does seem to be the case. I'll keep researching, but I do want to be able to adjust aperture etc.
I used my A520 to get familiar with the concepts so when I bought my Nikon D40 last year, I didn't have to learn from scratch (the idea worked, too, though I'm still far from an expert!).
I could do much worse than the A570; I was just hoping for a slightly smaller form factor.