Something like this?
Version E
(The Auto button, here, would set the slider as high as it could go without clipping. It wouldn't be exclusive to this particular design, probably. It's just that I only now remembered it.)
The reason I'd wanted pinch-to-zoom was to let you focus the camera. Right now, if you're shooting at 1280x1024px, you're looking at a viewport 600x480px wide while you try to focus the image. By letting you zoom in, you could see how sharp your focus really was. It wouldn't change what the camera recorded. However, I think this might have quite some confusion potential as the camera suddenly isn't recording what it's showing. I don't have any great ideas how to fix this, actually - can you think of anything?
I do agree that multi-touch is hard to discover. I think we should support pinch-to-zoom though because it's pretty standard - everything with a touch screen that supports zooming supports pinch-to-zoom. However, that's the only multi-touch gesture I'd want to implement. You could also zoom with one finger if you tap-tapdrag, if you wanted. Or just ignore the zooming altogether, which is what we have now.
i still like the exposure slider on the right hand side, and yes definatly have pinch to zoom that would help focus alot and everyone can figure that out, i mean iphones are in every pocket