I know this defeats the purpose of minimal configuration, but you can define those kinds of actions fairly easily by defining keymaps that compose multiple commands[0]. For what you're after, you could do this:

  keymap:
    normal:
      W:
        - "cursor::move_to_start_of_previous_token"
        - "buffer::change_token"

You can view the default keymap right in Amp, too, as well as a list of all of the commands. Happy to entertain a PR that sets that as a default keymap going forward. :)

[0] https://amp.rs/docs/configuration/#multiple-commands