You are looking for -rawsettings:
https://winscp.net/eng/docs/rawsettings
WinSCP GUI can also generate the script template for you:
https://winscp.net/eng/docs/ui_generateurl#script

Also note that it's /ini=nul, not null.

Hello,
I tried to connect with winscp.com with command line.
The SFTP server use RSA protocol as Host Key (it's an old switch, and i must connect to about 200 switches).
I i put in GUI the advanced option: HostKey=rsa,ed25519,ecdsa,dsa,WARN
I can connect, but i don't know what command line i must use to do the same thing.
I tried:

But i get "Signature from server's host key is invalid"

Thanks in advance