These options are only valid for FTP protocol.

Apply proxy on data channel - Use proxy for FTP data channel.

Apply SSL encryption on data channel - Use SSL for FTP data channel.

Data transfer mode - PASV, PORT and Auto, Auto mode will first try PASV mode, if it fails, use PORT mode.

List Commands - FTP Commands used when listing directories.

Directory list parser - An analyzer used to parse server file directories.

Directory charset - This feature is for the site do not support UTF-8 to listing directory. By select a correct charset you can read the right folders/files name. 

For example when you connect to a korean language FTP site with english windows system, without this option you can not read file name. after select korean and reconnect to the site, you may read it well.