Singles
The Singles imposition type is the simplest, in that pages are just single rectangles. You can make any number of differently sized boxes to hold page content. Optionally define margin and trim areas in each box.
The Singles type is compatible with Inkscape’s somewhat new custom multipage art board layouts, for which I implemented import and export, then they went and changed it to a more standardized SVG2 view tags, which I haven’t quite coded yet!
