It's a little thing, but often can be very annoying to have storeys level locked between them. Why not give us the ability to place storeys in free order or get negative deltas?
So we can put a level for terrain modelling in last position, even I've underground storeys, and hold it at "0,00"?
It's so little wish I get since I use Archicad (or at least since I use Architerra), and will never be a annoying for who don't want to use it, so I can't understand "why not?"
Another enhancement I think can be useful in some case (and partially replaces the wish above), is to get a kind of ghost storeys, that will showen in Project map only with an apposite check box. My idea is to add a checkbox to storeys settings, with wich I can define if a storey should be a ghost storey. In menu or Navigation palette, I should have another check to say: "show all storeys" or "don't show ghost storeys". If ghost storeys are not visible, I should even see the objects form this levels if they are set to be visible in other storeys, and I should see them in elevations and 3D, but I should not be able to navigate to this storeys, even I move up or down with keyboard shortcuts.