I have a few thoughts about cmd part.
If gui was focused on chapters, ceMTTags open it focused on mkv tags and vice versa (add some key (something like ceMCHAP) for open it focused on chapters). And for what purpose there are -l key? Can't see any differences with or without it.
And another thing to improve - can you make not create new window of gui, if program started already? Why new window, if it has tabs. More convenient open new files in new tabs.
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