Thanks for your post. This issue has also been added to tracker.

Hi there again! I have another feature request (after this one https://winscp.net/tracker/286 which has been kindly submited to ToDo list, as I've seen).

When program is working in 'keep directories up to date' mod, minimized to tray it should change it's icon when something is being transfered to notify the usere that something is going on.