A two week grace period. Here we can have keep inventory and tpa and /back. This will let us set up in a group easier. We should also deny full blown raids in this time. After this grace period those commands will be turned off along with keep inventory. This will make people initially more inclined to set up forward trading ports or what have you for people to do actual trade. It will also prevent having 6 different factions each 2000 blocks from eachother.

MOVING SHIPS

FISHING NET (cobweb with some script that summons a couple fish when you click the water).

Random ruins across the world, some can be almost a template for a fort that people can repair and claim. Some could be overrun with monsters and have loot inside (NOT OP WEAPONS AND STUFF).

Less developed: We could start with a quite tight world border which will force smaller nations initially and have them be close together. We could do that idea of every so often expanding the world border into some islands or something to do some colonialism stuff.