Hey amoooc, thanks for the kind words, we're glad to hear them.
I'm afraid we do not allow deployment of applications on port 10081.
For authentication, there are a few approaches:
Instead, you can deploy on any vhost you want instead of deploying on <default-server>. This vhost you can then configure manually in the apache configuration files to use any authentication scheme apache supports. You can also limit the interfaces that phpmyadmin is exposed to through that vhost.
Alternatively, or besides the above, you can use phpmyadmin's own config file to define a username and password for use in authenticating. If memory serves, they carry that functionality.
Finally, least convenient I think, you can empty out the user/password from phpmyadmin and I think phpmyadmin then reverts to the default "obtain credentials" behavior that you require.
There's a thread going on with lots of configuration examples for phpmyadmin:
Good luck, please let us know which method works for you, we'll be happy to improve the provided packages.