[gcmd-usr] ftp update instead of replacing all files

[calmar]

Hi,

MC has the ability to update a directory/files to a remote ftp
server. It will upload/replace only those file, which are newer or
similar.

Actually Gnome-Commander and all other ftp I know, don't have
this feature. Does the midnight commander use any trick to do
this?  Obviously it's somehow tricky when not many ftp programs
provides this feature?

Would there be any way to implement this?

Greetings
calmar