This was earlier requested on the meta site for LaTeX here at stackexchange, under When flagging for close: Adding a reason. The discussion lead to a suggestion to post the request here.
Posts on StackExchange are closed for numerous reasons, and ticking of the right box for the exact reason might not always fit the question quite right, or the reason might sometimes be very vague. For new users, knowing exactly why ones question was closed is not always clear.
As I see it at the moment, the default reasons for closing, are just categories. These could benefit from an additional mandatory field where a more fitting reason is supplied. The reason given doesn't need to be very long, sometimes, simply something like "Question is simply a typo", or something similar will be enough.
Now, there is, as mentioned in the answer by
Alenannoin the linked question, already a input-field in the
Off topic - Other-reason input. However, I think it would be better to have a mandatory field for all close-reasons, to give a more precise reason so that the user understands clearly why his/hers post was closed. Many times, these reasons are given as comments in advance, and this is great, but it doesn't always happen that way. Also, the exact reason should be provided in the text-box after the question has been closed, for ease of reading.
There have been numerous posts on problems with closing, which sometimes happens rushed, and feels harsh for new users. See Reviewers; what do you eat for breakfast? among others. Forcing reviewers to give a small, written reason could possible have a positive effect, as closing a post would involve not just steps with ticking the right box. Reviewers would also need to reflect their perspective on how the written reason would be perceived.
Now I am not saying that this community is harsh. For the most part, I see this community as very helpful, openminded, and nice. Closing of posts is mostly done in a nice way. But sometimes, it is not quite as good as it could be. This is more of a request for perfection, than something that is strictly necessary.
Edit: I get it. This was simply meant as a discussion, and it seems nobody agrees. That is perfectly okey, and I won't bring it up no that we have discussed it, and I have read other opinions on it. I agree, it would introduce more trouble that what it is worth, and possible counterproductive. Now, I do not feel that reputation should be withdrawn because it was an unpopular suggestion. I didn't think voting on questions had anything to do with agreeing on the content, but more on the quality of the question. But that is a different discussion, and I don't want to get into it.