The new Imagew v2 deploy image action will map a drive based on your preferred server settings. If you dont use preferred servers you still need your source setup as one with a dummy IP Range so that the client can use the credentials from this to connect to the share.
You still can use a map drive then the deploy image selecting the 'Other' option then point at imagew.exe but once you see how the new action works it is much easier as it finds imagew and maps to the preferred server automatically.