Thanks for the feedback.

It is indeed possible if you click on the next/previous issue in the Structure panel on the issue page. You might need to un-pin the widget so it shows the full structure.

If you're asking about a keyboard shortcut, like "n" and "p" that JIRA has for going through a list, then it would be a good improvement. But we're addressing it slightly differently - we're currently working on the "preview" panel for the Structure Board, so you can see the structure and the issue panel at the same time - much like in the latest version of JIRA's Issue Navigator (details view). Navigation back/forth with work there, of course.

If that will not solve your request, please elaborate why you'd like this also on the standalone issue details page.

Thanks!
Igor