4 sub attributes linked to the characters Primary attribute. Ill use the warrior class as an example.
With 3 ranks in strength allows points to be spent in "Swift"
for every point in swift base movement speed is increased by +1%.
with 6 ranks in Strength allows points to be spent in "Block"
for every point in block +1% base block chance while wielding a shield.
with 9 ranks in Strength allows points to be spent in "Rage"
for every point in rage +1% chance to gain +1 adrenalin.
with 12 ranks in Strength allows points to be spent in "stalwart"
for every point in stalwart +10% base health.
a system like this could allow a player to focus a build more to a specific task, elite skill or simply spend the few leftover points he has.
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