Usage of any external copyrighted source of information, in order to add information to the Waze database or maps, is not allowed. External copyright information includes any online or printed map information that is not provided by Waze like Google Aerial imagery.
Google's terms of use means that Waze cannot use their aerial images to update Waze maps. Those terms of use also apply to any user or editor of the Waze maps and database. Users cannot use Google's aerial images to edit the Waze maps. In some jurisdictions you may be able to use them as a reference (like looking at a map in a mapbook), but not as an overlay as with the Greasemonkey script Googze.
Using any source of external copyright information, such as Google Aerial imagery, puts the Waze maps under danger of being forced to revert all changes done to the map in your area / country.
If any user were to do such a thing, it would taint all the work that person did on the maps and Waze would need to reverse out all those edits. There could also be other adverse effects. Waze has already had to remove all the maps for Chile, and other South American countries because the source of the map data was not properly licensed (not the result of any Waze action).
So do not use Googze as a way of applying Google's aerial images as a replacement for Waze's licensed images when doing map editing.
Users may negotiate with officials in their country for access to aerial images that Waze can use. The user must be careful not to give the impression that they are acting on behalf of Waze. But as an interested citizen any user can speak with local authority, in a local language, to explain the benefits to their country in making aerial images freely available as a public good.
Note that external copyright information does not include any source of information that is provided by Waze through the internal tools of the online editor or application. Also any information developed independently by a user being physically present at a site is acceptable to add to the map as long as it is provided without copyright.