Yes, that is what I meant by using the random allocator for this. Just note that the option to add self-assessments should work even with a number of reviews set to a non-zero value. The allocator is supposed to randomly allocate peers for assessment and then - if the checkbox is selected - it adds the self-assessment. So, if you let it allocate three reviews per reviewer plus self-assessment, each reviewer should actually get four submissions to assess.
Workshop
How to set up self-assessment
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