Basically, we're making a new map, we'll be leaving our old one on for awhile (hopefully server-side inventories will come with beta without problems) Anyway our new map we are trying to figure out how we can make it one huge ocean with some big islands and a a bit more of small islands. Only problem is we don't know how. I searched a bit on map editors but nothing really was what we were looking for. Any help?
It may not work with every mod out there, but you can use it to generate different tree shapes for the biomes, raise or lower the water level, place nether blocks in the world so they can be mined (swamps will have slowmud, etc.) and a few more options.