Been thinking that should be a feature for a while. When the ddos started, I considered making a userscript to do that, but didn't since there wasn't much problem during my primary reading times. When it did happen (~once per 2 chapters for me) I would duplicate the img container div above it and increase the page number.
Also considered adding a way to reload a half-loaded image, which had become a common problem for long manhwa for me on mac with firefox. Durring the ddos I manually changed the img src to force a reload (added a "#" to the end).