Please post the request to PuTTY project.
It would be great if winscp could support doing SRV & NAPTR dns lookups when it looking for the servers host name and port. We regually use this with our ssh clients as the servers are virtual and can move around. DNS updates are to slow so instead we prepopulate the dns to allow for the host to be at one of serveral locations. By using SRV and NAPTR the server is always avaliable on the same name.
Regards
Mark