Make Openbox available again in next Knoppix and other suggestions

[szzsqing1]

Since after 10 minutes the post cannot be edited, I "edit" the post by adding comment...
More suggestions:
) In case of multiple monitors, on all monitors should be displayed the same view, not a shared view (i.e. one primary monitor (laptop monitor) with panel and on other monitor without panel) by default, since there are cases when somebody uses a second monitor because his laptop monitor is broken, And if the shared view is the default it is a nightmare to change to the good monitor... It would be nice a boot option to set this behaviour, too (in case somebody wants shared view).
) yt-dlp instead of youtube-dl (which is no longer maintained) and "telling" mpv to use yt-dlp