Thanks you for your creation. There's one thing: MC Command Center has the option to speed up and slow down (that's what i need) the career growth. Does it work with your mod per chance?
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Yes, it should be compatible. While I increase the difficulty of promotions by changing the goals, I don't alter the "difficulty" directly by slowing the progress bar like the MCCC settings do. It should be perfectly safe to use those settings in combination with my mod if you want an even harder experience.