Indeed the “Expert Network” was removed in GOS 5 in general. There is an advanced network configuration in our commercial GSMs. The removal of Superuser was by intention for the GCE.
About notes and overrides: If you are on a details page for a result, there are icons to add a note or a override in the icon bar.
We offer to build/assemble GSE (source codes) of GVM-10 on your own to get the GOS 5 Web-UI. See the downloads here:
We also offer a commercial product family of GSM appliances which have the additional benefit to connect the GSF instead of just GCF. Since GOS 5 we even cover our MIDRANGE with a new set of virtual appliance products: