Skill Systems for Castle and Crusades.

I have been putting a lot of thought into a skill system for C&C. Not for every setting, just for games that I want a little more detail in. While an easy solution would be just to give skill points. Allowing players to assign to skills to give bonuses to attribute/Siege checks. For example +2 to tracking or +1 stealth.

Which is simple and elegant. But what about skill groups like in Star siege?

For example:
Melee
Ranged
Domestic
Subterfuge
Wilderness
Lore
Education
Riding
Crafting

Instead of having prime and secondary attributes characters have prime and secondary skill groups.Each skill group also has possible specializations.  For example a rogue would have Subterfuge as prime, And pickpocketing as a specialization.

Now there is two ideas going forward from here. Either a specialization could give a set +2 to the Siege roll. Or specializations could have a bonus range from +1 to +5 based on skill points or some other determining factor.

Still need to put some thought into this....