1: The amount hammers can repair is completely configurable. You'll burn through resources making more and more with a normal, non hoarding playthrough. Maybe 2x default is a little much though.
2: I don't really trust the value because of mods either undervaluing or overvaluing items, hence why I went for stats instead. It still works out fine and I prefer it this way. Adding a few manual tweaks doesn't really bother me much.
3: Whoops, I must have forgotten to mark the mod as decompileable. I'm a big stranger to Github and the like, so I never really used it.
Edit: Updated with a decompileable version.