Themes and Theme voting are currently on hold as the Instructure Product Team works on implementing a better solution to collect your feedback. Read Ruth's blog for more information.
@dtodor Thanks for sharing this idea. We've edited the title slightly to align it with New Quizzes, as our product teams are no longer developing new functionality on the code base for Old (Classic) Quizzes. The current process for enabling LockDown Browser requires the user to navigate to the Respondus LockDown Dashboard; Respondus would need to be willing to devote resources to any enhancement project, so please be sure to contact them with this request as well.