Got it! Had to add a method to a few of the modes, and then bind a key to that method.

startup.rb:

class Redwood::ThreadIndexMode
  def toggle_archived_and_deleted
    t = cursor_thread or return
    multi_toggle_archive [t]
    multi_toggle_deleted [t]
  end
end

class Redwood::InboxMode
  def archive_and_delete
    t = cursor_thread or return
    multi_archive [t]
    multi_toggle_deleted [t]
  end
end

class Redwood::ThreadMode
  def archive_and_delete_and_next
      archive_and_then { delete_and_next }
  end
end

and keybindings.rb:

modes["inbox-mode"].keymap.add :archive_and_delete, "Archive and delete", :backspace
modes["thread-index-mode"].keymap.add :toggle_archived_and_deleted, "Archive and delete thread", :backspace
modes["thread-view-mode"].keymap.add :archive_and_delete_and_next, "Archive and delete thread, then view next", :backspace

Hope this helps someone out!

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