Which service / server are you connecting to using WebDAV?
There is another forum topic related to webdav with a lot of +1 replies :-)
If you wish WinSCP to support WebDAV, please tell us here, how would you use WinSCP with WebDAV.
As we are not using WebDAV ourselves, we would like to read your answer to understand it.
Disclaimer: it does not mean it will be implemented!