It would be nice if we were able to toggle if individual structures generate in the world.
This would allow pack makers to make a void overworld without for example villages but with a stronghold

My intend with this suggestion is actually just making the stronghold spawn in a void world with nothing else. Maybe this is more reasonable as the only separate strucure would be the stronghold

Yes, this should be mich easier and could be the only thing everyone wants to have. I’ll look into it

I think the easiest way to do this is by creating a data pack with empty structure files which override the vanilla structures.
I would never be able to give mod support because it's way too much. I don't think that I will implement this even for vanilla. I can try a bit but I don't have much hope for this.

How about also separating Bastions and Fortresses? Mainly because Bastions can give you some pretty overpowered loot relatively early into the game.

Yeah, could be useful.