What I'd like is the ability to zoom out more, without having to use the zoom function that erases all the resources I've put down. I would like to be able to zoom out more in edit mode. That's my top want.
WorldBuilder should also not allow people to save maps that don't have the minimum two rows of ice at the top and bottom. I believe only having one row is what caused my map to not load before.
There should be "X" close buttons on each map tab that's open so they can be closed without having to close the program.
The UI could be improved so that people know desert is required for putting in flood plains and that grassland is required for marshes.
There should be a generation routine to create completely symmetrical/balanced maps, with exactly the same geography and resources for each civ -- and exact distance from city states. A variation on this routine would give each civ unique happiness resources, to facilitate trading.
WorldBuilder should prompt users to add a name when closing the program if they've saved a map that doesn't have one, so there are no more "TempMap" entries in-game. Sometimes the game will use the filename. Sometimes it won't. So, it's better to give the map a name, but the name & description panel may be overlooked.
I would like there to be the ability to set specific starting locations for players and AI, instead of it always being random. This could, for instance, make it more fun for players by designing a map so the AI will be tougher (by avoiding design choices that cause the AI to perform poorly) -- yet leave more room for creativity with parts of the map designed to be used by real players.
Additional options for automatic generation would be nice, like "no desert", "all tiles forested", "all land, no water"... things along those lines.
A "no fog of war" option would be nice to have, so people don't have to resort to the debugger trick to see the entire map. I hope custom maps (not LUA) will be able to be used in multiplayer, and having this option would be helpful if someone wants to play-test a map with the AI prior to using it in multi-player.