Is it possible or can it be implemented to have a structure that a user spawns in when first creating a world? As you already have great schematic placement and a directory structure system I hope this is possible. Maybe the schematic has a certain name, ie player_spawn.schematic or is in a named folder.

I am thinking of this for modpack use. BTW, the modpack I am working on is for 1.10.2.

Different mc versions mod releases works the same way. You mean the priority of the structure for spawning order, its not implemented yet. All structures spawns randomly. That feature was in the Placemod, but I removed it and trasfer mod to the new StructPro, because prioritizing structures very complex task to solve it conveniently for users. Users want to see some unusual destribution. But maybe I will add this as additional feature later, but there is no garantee.

For clarity, a feature similar to what this mod does but with custom schematics:

https://mods.curse.com/mc-mods/minecraft/275538-spawn-temple