[capink]

Yes and No. In the first page of the wizard you must have at least the title field (author is not mandatory). In the second page of the wizard there is a button called "update metadata for the selected books" which opens a dialog that allows you choose what fields should be updated, there you can simply un-tick the title field and it will not be updated.

Edit: In the first page of the wizard if you do not want to use the authors column, you can map it to zero.