Very similar to how a comment is automatically posted in Stack Overflow when a question is flagged as a duplicate, I propose we have a similar kind of auto-comment when a question/post on Meta is flagged as Off-topic --> Programming Question.
Why I feel that this should/could be implemented.
These days we are repeatedly seeing so many programming questions being posted on Meta. Every time we encounter such a question, we drop in a comment saying that this is MSO which discusses about SO itself and that they should post their question on SO. And then flag the question for closure with the reason Off-topic --> Programming Question.
Its not a very big deal to type that comment, but wouldn't it be nice if that static, redundant text be posted as a comment automatically once a user flags that question as OT->PQ? That way the question is also flagged and the a comment is also posted to the user to post the question in right site, all in a single event.
And honestly, this seems to be a relatively simple feature to implement (atleast in comparison with the several other feature-request) which could very well save a min or two, for every user posting those redundant comments on such questions.