When you're extruding a 2D shape into a 3D object, is there a way to get it to cap just one end instead just both or neither,
OR
Once it's extruded without caps is there a way to then cap one end,
OR
Once it's extruded with caps is there a way to remove one of the caps?

I there a way to change the display from ghosting to wireframe and back on the fly? When ghosting, is there a way to make the hidden lines show up better, be more visible?

Thanks,
Mark