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Large update note today, basically the 7,8,9 keys can now control the characters height, width and underwear transparency respectively. You press the key alone to increase each aspect, shift+(key) to decrease it and ctrl+(key) to reset. interestingly this feature is entirely independent of the games existing body scalers.
Plus there is an additional quality level included, however for the life of me I cannot see any difference between 3 and 4.