Specialization is an ability to increase the effect of a skill by focusing on a certain area of that skill set. For example, pistol is a skill set including all pistols from holdout to heavy blasters. A player can choose to specialize in one aspect of the skill set such as Heavy Pistols for example to gain certain abilities when using pistols that fall under that heading.
A signature skill is taking the process one step further and narrowing the specialization even more by selecting a specific weapon, ship or tool as the signature item. For instance with our example above, the player could say choose a TAPH 8 (Heavy Pistol) in their inventory as their signature weapon. When using this weapon they would gain additional benefits including the Heavy Pistol Specialization.
A player must be Specialized in a skill area to gain the Signature Skill.
How does this sound? And lets come up with some examples of specializations and signature skill benefits.