I connect to one ftp server running Cerberus ("220-Welcome to Cerberus FTP Server, 220 Created by Grant Averett"). The initial directory of ftp server is mapped to show all drives on that server (disk drive C:, D:, E:, F: ). In TC I can see those drives as directories named C, D, E, F and simply open it. In SS I can see this messagebox:
...and then this listing:
When I manually set Initial directory in SS FTP Client plugin to e.g. "E", it works nicely:
So I think the "only" problem is to deal with the initial listing of drives. I can provide access to that server for testing purposes if needed.