You briefly mentioned loot tables...
Not sure of an easy way to do it, but custom loot tables, particularly for exploration reward, is somewhere I think most packs drop the ball. Even Sprout, as adventure based as it was, felt like the structure loot tables were very underwhelming. I'm curious if that's something you've given thought to, and if so, how do you balance it?
For instance, if you're just getting started, a blacksmith chest in a village can give you a decent step in the right direction by offering you a chance at some decent armor, free early game steel, and a few other things that can make life easier until you get a proper camp set up. However, later, an ingot is just one more thing for your storage system and that once appreciated armor is now just scrap or decoration. What's the thought process on making chests worth exploring for (both early game, and once you have settled in), while not offering such powerful prizes to make setting up actual tech trees unimportant. What items should spawn in your expansive array of complexes, and what level of stuff should be left out of reach?
Obviously, diamonds are always welcome, and in a pack with delayed automining, it might be a boon worth risk. I'm always a fan of free steel, mostly because it involves a time component (for most mods), and it only takes a piece or two to get into a few important parts (windmills from IE come to mind). Gold can be hard to acquire sometimes, and having a chance to loot a stronghold for gold seems fitting. Things like books and pistons are surprisingly welcome to me, as I never seem to have one in stock when I need one (usually for a crafting recipe).
Things like RFTools Machine Bases are on the boarder line for me. While not an actual machine, it saves some crafting steps and saves the storage space of offering the components individually. It would promote delving into the mod, but not pigeonhole the player due to the choice of what to make with it. On the other hand, what other good uses does Lapis have, aside from a little enchanting? It's not much of a gate once you find some, and you're going to be mining in those levels anyway.
I would love to hear thoughts on the topic.