This is a good idea, full support. However there is one problem with the part of using wind, water and such to power machinery. You can simply build a redstone clock add a piston on the end, then boom the piston goes back and forth powering your machine forever. If this doesn't make it into vanilla Minecraft, because of the problem with being added in late, then like someone suggested some where to add a sequel to Minecraft this would be a great feature to have.
I think they might be not attacking because they are the npc villagers. Notch said there a "scary" mob not a dangerous one. It would be cool if a player sees one and screams "ahh monster!" and the farlander screams "ahh monster!" or something like that.
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((of course we needed to know that, don't be silly [/sarc]))
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When a gremlin is on board all mechanics and electronics are screwed.
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