Your own N950* and whole bunch of IOs/Android alu devices seems to "think" otherwise
Seriously though, I'm in direct contact with some friendly people involved in Neo900 thing and I have promise of being able to borrow Neo900 "final", working board, as soon as they become available, to check for quirks (even though, considering that Neo900 is supposed to use N900 cases anyway, there shouldn't be any compatibility issues).
No plans to eliminate need for spacer at this moment, though.