Looking over the concerns of players, I wanted to also suggest a method for equipping actions/spells that is slightly different from what is implied currently.

People are concerned about the lack of different tiers and spells. One method to combat this would be to use something similar to the blue mage system in ffxi. In this case, you would have access to all abilities from your base class, and can then equip 10 abilities from other classes. The action bar however would be seperate from the equip menu, and equiping a spell would add access to different tiers of the spell.

I.E. you are a Gladiator, you get all of your gladiator actions and traits, and then you also equip cure and sacrifice.
This would allow access to cure, cure II, cureIII, sacrifice I, sacrifice II, and sacrifice III.

This could then be limited by tiers, so that the equiped abilities determine the abilities, and the character level determines what tiers are available.
Level 1+: Tier 1
Level 20+: Tiers 1 and 2
Level 40+: Tiers 1, 2, and 3