I understand that this is a bit frustrating.
I talked with the developers about this a few times and the issue tracker contains some issues about this.
But, it will probably not happen in the near future as it gives the gwt dev team the opportunity to more easy make changes and not creating a locked in situation and drag around a lot of legacy code.
Don't forget that GWT doesn't exists that long and probably things will open up as soon as it's more clear how all should/must look.
Solution/Workaround: copy and improve it yourself and override it through gwt config if needed.