I keep finding that my photos have been duplicated on my hard disk, because F-spot doesn't recall the state of the Copy file to the Photos folder option.

The easiest solution would be to remember the state of this setting between imports.

Some people may then forget to select it when importing from their camera or other removable media. In this circumstance I think that F-spot should prompt the user to remind them they are using removable media and ask if they would like to copy the files over. In this case, the remembered state should not be changed.