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-When your soul crystal ability is activated in battle, it strengthens cross-class abilities for a set time that would otherwise be ineffective/unused. For example, when setting additional abilities as War, I might put Raging Strikes into a special soul slot, giving me access to that ability when I activate my soul crystal in battle (long cooldown timer, of course).
The biggest problem with this is that not every ability has a similar cooldown and yet you're giving them the same cooldown, which means that everyone would take the same exact abilities. All DPS (except BRD; BRD basically gets screwed in your system because they already get all cross class +dam CDs) would take Raging Strikes (same +dam as BfB without that pesky "take a crapton more damage" that lets it get away with being 80 secs instead of 180); healers would grab Mantra; tanks would grab either Keen Flurry or Raging Strikes (*maybe* Quelling Strikes for PLD when they're OT DPS). You're not really adding variety because there would be pretty explicit best choices.