6) Something like a weaponsmith/armourer/conjourer skill, or even a full working jobsystem would be great
How about creating your own spells?
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That's pretty Morrowind (createing your own spells, that is). I'd like a weaponsmith/armourer skill though, like Arcanum but better <img src="/ubbthreads/images/graemlins/up.gif" alt="" />!