How to include the DOMAIN\ in the name autofilled field when connecting to a Samba share from Finder?

I have a samba folder saved on my Finder Favourites. The Account field for the associated server in Keychain includes the domain (so,DOMAIN\USERNAME ) but when I click to connect and the Account and Password are autofilled, the DOMAIN\ isn't included and I have to manually type it in every time. How do I force the DOMAIN\ to be included?

What works is to specify the DOMAIN by connecting via Go → Connect to Server (via this crazy old site).

smb://DOMAIN;[email protected]/Share

You can mark this as a favorite in the “connect” dialog as well as add the resulting shared folder to Finder Sidebar or even drag it into startup items system preference pane.