Yes, I'd definitely like a built-in dark mode. Right now I use the approach outline here that uses Stylus plugin and a theme that applies to any URL with /dataloadeditor/ in it (so it works for Client Managed or SaaS).
This would absolutely solve the printing issue we have! While we're still mid-transformation, many of our staff member still like to be able to print Qlik sheets. Since we use a dark theme, the print often come with A LOT of dark ink/toner on them. If there was a style toggle, we could create and standardize on two themes: one for briefs, and one for printing.
Thank you all for your feedback on ways to improve our product. While this is something we understand would be useful, it's not on the short-term roadmap. Please continue to show your support for this idea by commenting and liking.