In my opinion, questions related to troubleshooting a system or software on that system would be off topic here.
For example this question: Is there a way to make Photoshop CS6 work with touchscreen monitors? refers to how to make software behave differently. It has absolutely nothing to do with design or anything remotely connected to design. I voted to close and commented. It is my opinion that allowing this question also allows "My mouse is sticking, how to I unstick it?" Simply because a computer or piece of software is used in design does not make a question design related.
Then I see this question: https://graphicdesign.stackexchange.com/questions/18759/my-keyboard-shortcut-for-canvas-size-is-broken Which is exactly the same type of question, Yet it was migrated to SuperUser.
Both questions are about trouble shooting software, and not solving a design issue.
I think allowing software troubleshooting questions will merely balloon the "help me my Adobe doesn't work" questions here and will quickly make this site not about design.
So what criteria is used to determine what is a superuser question and what isn't?
As the above example show.. there are clearly no defined standards.