The battle system is very derivative of FFX's, yes, but I don't see how it can be called a lite version of it. If anything it's FFX-improved. Boost and Break systems totally increase the strategy value and make the battles even more enjoyable than FFX's imho.
I was thinking more along the lines of Skill Line and Sphere Grid when I said that, I kind of consider those involved in the battle system as well, if only because I'm not sure how else to classify them. If we stick purely to what occurs in actual battles, you're right about it having more options than FFX, IMO. Either way, they're some of my favorite battle systems in any RPG, so I don't mind!
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xp1337: Don't you wish there was a spell-checker that told you when you a word out?
GotD (219/384) Melee v FFX