Continuous synchronization: https://winscp.net/eng/docs/library_example_keep_local_directory_up_to_date
Warning that the a remote file has changed: https://winscp.net/tracker/99

Maybe this functionality already exists, but if two people are using "keep remote directory up to date", they can accidentally overwrite each other's changes. If there was some kind of continuous synchronization,or maybe a warning that the a remote file has changed would be helpful.

Thanks,
Kevin