user10401: I review posts in the queue, and I am often am flagging some posts. I will sometimes flag posts as those that need to be closed because they are off-topic, but this is the only option available:



Obviously there are many other SE website where questions could potentially belong. These include Medical Sciences.SE, Psychology.SE, Bioinformatics.SE, and Chemistry.SE.
Can these options be added?

user28778: Normal users can only vote to migrate to sites which have graduated, but moderators can. 
Out of your examples, all the sites are in Beta except Chemistry.SE, so I think it could be added but there is also a close reason that states "General chemistry questions are off topic...." and redirects the OP to Chem.SE
A similar question was also asked before.

10401: <p>I review posts in the queue, and I am often am flagging some posts. I will sometimes flag posts as those that need to be closed because they are off-topic, but this is the only option available:</p>
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<p><a href="https://i.stack.imgur.com/kKfFQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kKfFQ.png" alt="enter image description here" /></a></p>
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<p>Obviously there are many other SE website where questions could potentially belong. These include Medical Sciences.SE, Psychology.SE, Bioinformatics.SE, and Chemistry.SE.</p>
<p>Can these options be added?</p>
 28778: <p>Normal users <a href="https://meta.stackexchange.com/questions/258593/do-the-new-graduation-policies-have-any-effect-on-migrations-to-beta-sites?r=SearchResults">can only vote to migrate</a> to sites which have graduated, but moderators can. </p>

<p>Out of your examples, all the sites are in Beta except Chemistry.SE, so I think it could be added but there is also a close reason that states <em>"General chemistry questions are off topic...."</em> and redirects the OP to Chem.SE</p>

<p>A <a href="https://biology.meta.stackexchange.com/questions/621/why-cant-i-select-any-site-i-want-when-i-vote-to-close-a-question?r=SearchResults">similar question</a> was also asked before.</p>
