In order to optimize pdf files for my ereader, i would like to print it to 90 x 120 mm. DoPDF has that option. Strangely enough, once you have set the custom page size, it deselects all pages, so there is nothing to print. Once you reset to A4, all pages come back and you can print.
How can this be solved? If not, what is the point of offering a custom size for printing with which you cannot print?