In any case, Sneaking itself should probably cost quite a lot of AP. I realize that hinders "true Rogues" somewhat. There may need to be a Talent to counteract it, but only available at lvl 5 Scoundrel.
That's the other problem, Sneaking has a definite "5 or bust" syndrome to it. There is no possible way to make a 4AP Sneak balance while also allowing a 1AP Sneak to be balanced.
I think the role of the ability and the role of the talent should be switched. Such as...
Sneaking (Skill): Now costs 3AP as a base.
Sneaking (Ability): Adds 30% damage to attacks made while sneaking per rank. Does not decrease AP cost of Sneaking anymore. Renamed to something more appropriate.
Guerilla (Talent): Now reduces the AP cost of Sneaking by 1 (to 2AP). No longer increases the damage of attacks. Renamed to something more appropriate. Might have a higher prerequisite (ex: Sneaking 5).
