This would be really great!
There is a secureFTP plug-in available on www.ghisler.com
(home of Windows/TotalCommander), but that is not as nice as WinSCP. And it needs additional stuff on our Linux machines.
Using this plug-in would be the ideal extension of WinCmd for us.
The plug-in interface is quite simple and shouldn't be that big deal to use the pascal interface structure with C++builder WinSCP is actually made with.
All documentation about the plug-in interface including sample are found here: