Newest idea: Primary, Secondary, and Tertiary skills.
Primary Skills: At 1st level heroes of all roles get 2 primary skills. These are the hero's personal specialties. The hero's primary skills start at 4 ranks, and increase at a rate of +1 rank per level.
Secondary Skills: A hero also gets a number of secondary skills, depending on his role. Adepts and Warriors recieve 2 + Intelligence secondary skills. Experts receive 6 + Intelligence secondary skills. The hero's secondary skills start at 2 ranks, and increase a ta rate of +1 rank per level.
Tertiark Skills: Any skill learned after 1st level or otherwise gained through the use of the Skill Training feat is a tertiary skills. There is no limit to the number of tertiary skills the hero can have. Tertiary skills start at 1 rank, regardless of the level at which the hero gained the skill, and increase at a rate of 1 rank per level.