Elemental Weapon spells don't permit Elemental Spell

[FrijDom]

Gozreh's Trident and Flame Blade don't permit you to use Elemental Spell with them, which by RAW, they should, although the secondary effect of Flame Blade Dervish wouldn't really apply (ignoring the first 10 points of resistance). I'm not sure if it's a technical limitation, though.