Shattered Kingdoms

I was wondering if Sorcerors could have specialization of certain spells. after all like mercenarys, they are the basic class for their skills. it would give a little diversity from one sorceror to another.

No, but they do have art which is similar to a form of spell mastery where one caster can be significantly stronger in penetrating one's saving throws than others.

If you are looking for certain school specialization like in dnd, notice that they even got rid of that in 4th ed. (Or so I've heard).