(1) As with Minecraft, add a restore to seed selection tool. This greatly eases the burden of cleaning up terrain 'messes' on servers. Maybe add it to F5 (terrain) toolbar menu.
(2) Under F6 (Placement) add animal/NPCs to be placed in selected area. Preferably with a filter of selections and number you can choose from (e.g. select an area then choose types of animal/NPC and the number of each).
I'll add more as I think of 'em. The two above would make this great game much easier for server admins forever trying to keep their Worlds Rising.