Thank you for the helpful context, Deri, much appreciated. I checked the sources thoroughly, in order to have a good reasoning, but missed to read the grodvi sources :/
Following the same order, i.e. width,height, to allow the same source to run on either dvi or pdf makes a lot of sense; too bad this introduces a little inconsistency with other paper format specifications. What are your thoughts about naming the argument for the papersize control command `paper-size` to distinguish it from the `paper-format` argument of the -p option? Best Alexis