1. None.
2. Same
3. Learning the basics. Items spawned/given to character (~pike/fishing rod/handaxe/shovel~). And Adv. Adventures has same completion reward.
4. Check the Released Mods sub-forum. (Buoidda’s Crafts, and BAC are popular. Privateer has released various mods with features beyond in-game crafting. Night has released couple tools for hacking/memory access/starting location. And there’s more modders and mods out there)