I frequently use bpmn.io for screenshotting bpmn diagrams (a PNG export would be nice by the way - or at least something Powerpoint can use ( Powerpoint cannot import SVG)). During the screenshot of the day I had the problem that one zoom level was too small to be readable and the next one was too big to fit on screen. I missed basically one “zoom step” in the middle (when clicking on + and -; not sure if there some other magic I do not know).
It would be nice to be able to configure those settings, for example passing some options at BpmnNavigatedViewer’s creation time, anyway without changing the source code.