I've never hosted, so dunno if this has already been implemented.
We all know what a pain it is to first clear out an area, which takes days...
Then you'd have to box off the area, somehow avoiding griefers...
Then you'd have to rebuild the entire area, then delete it all again to drain...
Finally, you'd have a clear place to build. After all those painstakingly hard days.
But it would be awesome if the OP could set the area to be completely clean. I mean, absolutely nothing is there but water. Another setting could make it the same, but all water is blocked off, giving the perfect area to create some revolutionizing area. Such as an actual town, or a massive tree.
The blocks surrounding the area would be undeletable, as to protect from griefers royally screwing everybody else and flooding everything.
actually, the ability to control things during map generation would be cool... if youve ever played Sim City, when you generate a new map, there are slider bars for things like amount of mountains, amount of surface water, amount of trees.
not sure how the generation is implemented but if its possible to change the parameters to change map generation it would be cool. Things like surface water %, surface lava probability, flatness of terrain, amount of trees. perhaps changing the amount of caves pre-carved would be useful as well. If you set the amount of caves to zero you could just make your own and not worry about accidentally flooding them
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Eighth Blocks. Plox. It would make me so very happy. (click it!)
Maybe a "drain" block? with finite water, it would allow the water to neatly disappear (without littering the landscape with sponge monoliths). In multiplayer, the block should only be placeable by ops. Also, I think solis has a great idea, and I wonder if (and if not, then WHY not) somebody has thought of this before.