@sdetweil Yup, there’s an option in both modules.
randomComic Set to true, if you want to see a random comic on days, when there is no new comic.
In MMM-XKCD there’s also an alwaysRandom option:
randomComic bool false Display a random comic, where no new comic is available.
alwaysRandom bool false If you always want to see a random comic, even on days where a new comic is available. Note: Only effective if randomComic is set to true.
I’m currently running DailyXKCD, so If I’m reading that right, my config has updateInterval set to 3600000 which is 1h, I should get a new comic every hour (for testing!).