I'm trying to run n-gdu on a blank DVD+R, and it is offering me a bunch of filesystem choices, among them some questionable ones, like swap or empty. 
Why would anybody want to do that ?! I don't think those choices are useful at all in a simple formatting utility.

Also, I think we should preselect the most useful choice of filesystem for a given type of medium. 

It might be even better to relegate explicit filesystem choice to an "advanced" section and just have two simple choices, like

(*) Format for data exchange with other operating systems 

( ) Use native Linux filesystem