where can I configure the service principal name for a host

I'm using GSSAPI with Quest Putty.
However, due to Kerberos REALMS differing from DNS Names, I have to specify custom Service Principal Name in Putty.
Where can I set this information in WinSCP?

WinSCP does not support that.

This request has been added to the tracker:
https://winscp.net/tracker/1472