Following the advice of @adriaan.games, i'll share my Godot proposal :)
This would dramatically speed up 3D level blockout creation, by applying vertex snapping to CSGPolygon3D nodes. github.com/godotengine/...
github.com
Add 3D vertex snap for CSGPolygon3D vertices · Issue #15394 · godotengine/godot-proposals
Problem or limitation Since godotengine/godot#117235 it is possible to have vertex snapping in the 3D editor. The snapping does not currently work when moving vertices inside of a CSGPolygon3D. See...