In the data import/export screens for CSV you are given the choose of which columns to use. At the moment if you have a large number of columns, but only want to select a few, then you have to untick manually a lot of boxes. Please can you add a deselect all and select all option to this screen?
You can use SHIFT+CLICK similar to the gmail interface.
I've just tried it and on this particular screen you don't seem to be able to. The screen is titled “Column Mapppings And Transformations”. Running on Windows 7.