Brendan,
Simply provide a URL without any path components (e.g.
ftp://ftp.mydomain.com/) in the "Select Web Sharing" dialog while adding your FTP server and in the advanced options (which are revealed by clicking on the "Show advanced option" link in the lower-left of the dialog), select "Custom text" in the "Album name" drop-down list and blank out the text contents of the following field.
Good luck,
Berend

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