I am currently also participating in the IfcSpatialZone Working Group of buildingSMART International, moderated by Gianluca Genova.
Probably someone from the WG already contacted Graphisoft in regards to this topic. Anyway, let us know which is the current state of this implementation from the GS side.
David Delgado Vendrell
i7-7820HK CPU 2,90GHz 32GB RAM
Triple Monitor 17"+25"+32" Nvidia Geforce GTX 1080
SSD+HDD, Win10 Home - 64 ENG
AC18-AC26 INT/SPA (64-bit, latest build)
Surfing with Archicad since 2013