The Terrarium world needs to be playable in survival. There are a few things that need to be considered:

• Biomes. Currently, players won't get the full range of biomes, meaning ocelots could never spawn because the world has no jungle biomes.
• Random caves + resources. These would be optional. Resource generation may be tricky, because it'd require also invoking modded generators, which may or may not work well with the mod. Maybe mod compatibility could be an option of its own?
• Flowers, sugar cane, cactus, pumpkins, melons and mushrooms need to be generated. (Modded generators apply here too)
• All types of wood! Currently only a few types of trees generate, limiting wood choice.

A possibility is multiple presets which have different glob generators. One would be realistic, and the other would be survival playable. Ideally they wouldn't have to be too different.