Re: 3d cursor help
In move/size mode, holding down alt and dragging the mouse with the left mouse button will reposition the 3D cursor. The 3D cursor is used to specify the missing coordinate like you say.
(so for nearsnap to work like you want, you would line up the 3d cursor with the plane of points you want to snap to. Nearsnap looks in all three dimensions for the nearest point within the distance specified in File->settings)
HOWEVER, from experience, most people (including me) never use the 3D cursor at all because it's so easy to make things and then reposition them afterwards.
Andy
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