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I'n sure this was mentioned before, but I only got to be annoyed by recently. Not being able to change all the metrics the way you want. I have speed set to KMs/H instead of MPH but I can't have weight measured in KGs but only in LBs.
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Also (may have mentioned it), lack of AI in private lobbies for casual friends. Even if it's a small amout like 6 AI cars.