A friend and I are using G-Portal to run a small server, and while operating it we are having difficulties adjusting settings and getting them to stick. Main point, after figuring it out and finally adding some mods, we came to the conclusion to go ahead and restart with a new world. Yet, nothing worked when it came to changing the server's world name or seed, it would default back to its original designation. Eventually I managed to get it working by just deleting the server's save of the world, and having the config set to a new seed made it finally go through with the changes. After playing a bit, realized no custom settings were applied so I ran the commands and restarted the server. All said and done, I came to the conclusion again that a new world would be great as plenty of exploring was done and new chunks are rather far away already.
Okay, the meat's done and here's the actual question: Could I upload a single-player world, with all of its world generation settings, and use that instead? If this is done, would I have to modify any settings afterwards, namely month length, world size and ore density?