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Why do you think crop tool is useless? Since I'm alwasy using it. It can change selected range by dragging the edge -- that's what I think is convenient than the marquee tool. Though there is an annoying edge adsorption, you can zoom in to avoid it.

The cropping steps of me is:
1. zoom out the image then you can view all of it;
2. Use crop tool to select it all; (It won't overlop the range of image, so just do select randomly)
3. Zoom in on every corner and drag the edge to change the range of choice (DO NOT drag the selected area itself, it will just move it instead of change its shape..)
4. Click "crop"