Universal-N is a factory option when you go to edit a factory, but not when you create a new one.
Yeah -- I've noticed that it seems glitchy - I just wasn't able to put my finger on the problem. Luckily I've been making some games where pretty much all factories are Universal-N, so I just make a regular factories, then do a find/replace to the xml file.
Yeah the XML input/output really helps sometimes.
Fixed, thanks.