How should off-topic questions be flagged when no off-topic reason from the dialog applies?

Question

Currently, when flagging an off-topic question, the following choices are offered.

• Questions about general computing hardware and software are off-topic for Stack Overflow.

• Questions concerning problems with code you've written must describe the specific problem and include valid code to reproduce it.

• Questions must demonstrate a minimal understanding of the problem being solved.

• Questions on professional server, networking, or related infrastructure administration are off-topic for Stack Overflow unless they directly involve programming or programming tools.

• Questions asking us to recommend a tool, library or favorite off-site resource are off-topic for Stack Overflow as they tend to attract
  opinionated answers and spam.

• This question belongs on another site in the Stack Exchange network

However, there are some questions that fit in none of these categories. For example, career advice questions are off-topic here (and on programmers.SE), questions like this one about an iPhone not connecting to WiFi are off-topic on pretty much any SE site.

Some questions might also be relevant on another SE site not listed when the "belongs on another site" option is selected.

How should those questions be flagged? Why isn't there a "it's off-topic because it is" option?

EDIT: just to be clear, I don't have the "Other" option under Off-Topic.

Answer 1

Once you gain enough reputation to vote to close, you will be able to add a custom close reason:

The process is

• close
• It doesn't belong here, or it is a duplicate
• It is Off Topic because
• Other (add a comment explaining what is wrong)

If you don't have enough reputation, you can flag it as "Blatantly off-topic" as explained below.

Answer 2

This option wasn't available at the time the question was posted, but when you don't have enough reputation to cast close votes, you can flag the question as blatantly off-topic.

This option disappears once you have enough reputation to cast close votes, when Benjamin Gruenbaum's answer applies.

The flag will be marked helpful when one other user (with enough reputation) votes to close it as off-topic (the reason doesn't matter), or if the question ends up being closed because of another reason (duplicate, too broad, etc.).

You should leave a comment indicating why you think it's off-topic, unless it's obvious (like a question about gardening on Stack Overflow).

Answer 3

Possibly the best option here would be to leave the Other option visible to all, (and the close button), but greyed out with "You need a minimum reputation of to use these options - if this issue does not fit any of the above then select flag for moderator attention on the first page".

Answer 4

You can flag it as any reason. Then as long as there are other 3K-ers voting to close it with the same reason as your flag, or the question is finally closed, it will be considered as helpful. Which sub-reason for flagging for OT doesn't quite matter as you can still leave a comment expressing your concerns.

Note for terminology: You can only flag for closure if you have <3K rep, but only vote to close if you have >=3K rep. When you have 3K rep then a custom OT reason is available for you to type in so it'll no longer be a pr0blem that none of the given reasons fits.

Thanks to Glorfindel for correction.