I am genuinely confused. That's all I can say. In my developer environment (for 1.6.2 as well as my new one for 1.6.4, they include IC², CCC and NEI), using my 1.6.2 release, I cannot recreate the error, everything starts up normally, etc. But once I put them into an actual minecraft installation, this weird error shows up, calling me out on using a method that does not exist, something to do with ItemHoe.. Which has nothing to do with the constructor of ItemWoolPart nor setting its unlocalizedName. Just...what? I really have no idea how this could even be remotely related. If someone is less confused than me, here's the source code:
Unidye
ItemWoolPart
Regarding the exploits: Like I said, these were not really in my mind since you don't really use them too often, at least in the modpacks I play, I will take the exploits out then. Another thing I would be really interested in are your opinions on balancing my mod. On my GregTech Survival World, I gathered some sheep early and used the wool in the generator instead of coal (those went into Coke Ovens) or Wood/Charcoal, which I thought was pretty handy..maybe a little too handy? But that's just GregTech, in normal IC² I doubt wool farming would be a viable early game energy generation.