The fire missiles spell does not work and cannot be found anywhere in the game. And as for rune magic, the only findable spell other than the ones sold by Grymlok is spitting shield, for whatever weird reason. So I assume all rune spells except spitting shield and the ones in Grymlok's inventory don't work (even if you edit them in). Too bad, because rune missiles would be so c00l...
No idea why they even wrote "new spells" on the collectors edition case/manual, since there are no new spells available - the ones that didn't work in 1.4 are still not working in the CE. I'd rather have all of them available and undo the adding of unneccesary furniture in interiours, reason: the spells would be cool and add variety to the game, while the only function of furniture (like tables and such) is to make Urgoths get stuck because they're too big to fit through between them!