Don't use cache when synchronizing with FTP server

I'm using the synchronize feature very often to compare my local working copy with a remote FTP server. In that case I find it unacceptable, that TC seems to use cached file names/dates. Synchronize should do, what the name suggests: make sure, that the local copy corresponds to the server version.

You know, I'm not the only one updating the FTP server, at any time someone else might have updated the FTP server files. But, as far as I can see, TC uses it's cache, when synchronizing, at least for all directories, it has seen before.