Silvah

I am trying to find out if there is a way to use UDF when building RIS via single cd type image and ristndrd.sif? I have looked around for a area to can specify like you can with just a straight answer file (/UDF) but I can't find anywhere that you can do this. Is it even possible? or is there another method of porting unique sections into a RIS build using ristndrd.sif? I would appreciate any input. Thanks.