There's hidden configuration option for that:
[HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\Configuration\Interface]
"KeepUpToDateChangeDelay"=dword:000001f4
The value is in milliseconds.
I have a scanner creating and exporting Data automatically, and I would like to have WinSCP upload the Data everytime there is a new picture exported in the directory. But because the Keep up to date function starts with files, that are in use the export fails. Export is pretty fast, so I think if there was a 10 sec delay between recognizing and uploading my problems would be solved. But I cant find anything to ad a wait command neither can I find an option in the GUI.
kind regads blacky