Use the dumper and check all lines with "Function" entries in
ObjectsDump.txt. You'll get the stuff eventually
The game itself is kinda linear, in the sense that you cannot progress through certain sections unless you've done some quest(s) before. Like Elia and that rod/stone crap. Plus the engine won't load the solid decals if condition is not met (you can "phase" through the big tower wall, but once you land from noclip, you'll fall through the non-solid floor). So.. linearity
As for spawning, the command is "summon <item_class>". However, this works only if that class was constructed (grabbing the items from a loot cache); else, summoning won't do anything. You can use AshenAddItem or GiveItem, forgot which, with given item_class. That I tested and works.