The command line handling is ready: Merge → Show command line. The quoting is intentional. It may look ugly, but it actually is the only proper way to escape for cmd.exe.
What you think you know about escaping for cmd.exe is most likely incorrect or at least incomplete. See
this informative but frightening blog post from a Microsoft employee.
BTW: I'm sorry to say but cmd.exe stinks. Especially if one is used to sane shells like zsh or bash.
And what do you mean – you »copied the current command line«? You definitely copied one closing parenthesis too much, I have no idea where you got that one from.