<p>We <em>can</em> enable more close reasons, but we are trying to hold off on doing that unless there's a demonstrated need because long lists have historically proven to be, at best, confusing. </p>

<p>At the same time, we certainly recognize that some sites have different needs. For example, Stack Overflow already has 5 off-topic reasons instead of 3.</p>

<p>What other close reasons would you enable if you had more than three slots available? Are they applicable frequently enough that just leaving a custom comment when closing just isn't practical?</p>

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<p><strong>Update:</strong> I activated one more close reason slot and filled it with "this problem cannot be reproduced" close reason. </p>

<p>I may be misunderstanding its purpose, I would advise against reactivating the "this question has been abandoned" close reason. We regularly <a href="http://meta.stackexchange.com/a/92006/155160">clean out <em>really</em> abandoned questions</a> anyway, and you can't always predict when a question might pick up a response. Closing questions just because the asker might not be around is an unusual practice, or at least something that hopefully is not so frequently necessary that you'd need to spend a close reason slot on it.</p>