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If you mean moving the selection you've made for the crop area, make sure you're still on the Marquee selection tool and not pointer tool. You can move the selection in increments with arrow keys,

If you mean adjusting the size of the selection area with the move tool.... I don't think so either. BUT I have a workaround...

unflatten your image - double click the Background layer so it will become a layer. Do your approximate selection and crop. Change the canvass size in increments and with the pointer tool, click/drag the layer or select layer and move with arrow keys till you get the crop size and view you like right.

Hope this helps.