Great topic. I'd like to see:

* Party Combos: Something like the Triple Tech (Chrono Trigger), or Skillchain / Renkei (Final Fantasy XI) or some stylish improvement on the Battle Regiment system in 1.0.

Just some way for Players to try and link / string certain Weaponskills and/or Spells after each other to create a special Combo / Bonus Effects that are meaningful.

It opens up Combat and makes it far more interesting and engaging than it is now.