I've been searching for a plugin or even application that will selectively regenerate chunks that have not been modified from the original seed or doesn't contain man-made items (found one that was supposed to do just that but I believe it was outdated). On my server people like to walk around for a few hours making the map kind of large (I've got about 1.5 GB of map files). When minecraft updates with new blocks, we have to travel quite far for them. This search really started when quartz came out. We don't want to regenerate the entire nether, only the chunks where our transport system isn't located. I would like to have something that could be used in the over world too.