I want to completely disable outlier removal. My data is not normally distributed, so I need all the points to affect the mean.
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Can you explain more about what you want? Ordinarily the boxplot doesn't remove outliers, but instead shows them as separate markers on the plot. Is that what you want to prevent? Here are two invocations of boxplot, one of which includes the outlier in the box-like part rather than as a separate marker:
The line across the center of the box is at the median, not the mean, so the outlier doesn't really affect its value directly.