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I don't think we need a short version for this flag. We're running out of characters for flags (. is already an odd character to use for a flag, and after this, we're going to have to resort to even more weird flags). It's okay to make users type out --fancy-repl, which is enabled by default anyway, and is only necessary if you already have the environment variable REPL set to false, which is such a specific use case that only someone working on Vyxal would need --fancy-repl. If --fancy-repl is too long to type, you can use Powershell 7 or Zsh or something with autocomplete.