Hi,
if you want to use the default value of a data field to pass the record delimiter, then you need to set it to “\\\\n” (without the quotes) and set the field to be non-nullable. However the need for 4 backslashes is currently a bug, we will resolve it in the next release (only 2 backslashes should be needed).
Other mechanism are graph parameters, which can be used throughout the graph via ${parameter_name}. So you could create a parameter for the record delimiter (the parameter can even be used in the metadata editor). See the wiki for more info about parameters.