I actually prefer the opposite. Like, maybe it'd require both Warrior 3 AND Fire 1, so it's a skill that's distinctly for warriors, but it gives you more choices, rather than just pumping all your skill-points directly into the warrior skills.
That's another approach, but it would require adding a good number of additional skills, both to make going the hybrid route seem worthwhile, and also to avoid stripping too many existing skills from single-skill requirements.
