I'm a bit confused. Just to make it clear: I was talking about moving/copying from remote server to local desktop not the other way round, so I do not know, what "target application (usally Windows Explorer)" has to do with this one.
In Windows it is a target application which controls most of the drag&drop operation. Like selection of copy/move operation.
Well, anyway, if there is no way to solve this, would you mind adding a preference option on this, like Default behaviour
As stated in my previous post, WinSCP CANNOT select the default operation. It can only suggest list of meaningful operations. In this case WinSCP forbid explorer to select "create link" operation, because it is nonsense for remote files.
So only solution would be revert to older version behaviour, where "move" was not allowed, thus "copy" as the only option become the default.
And still, you may hold Ctrl key while dragging to select "copy". Just as you can do it with Local files. This is how I do it, so this is also why I haven't realized that the menu does not work (I do not use it). I haven't even known that there is a "menu" feature with right mouse button. It was WinSCP users who has pointed me to it.
Also to make menu selection work, you may revert to older drag&drop mechanics in Preferences Window ("Use temporary folder" option on drag&drop tab).