Well... i've been playing Theatrythm a LOT recently, and thought of something.
For battle themes, you use four rows, at least unless you preform a summon... So couldn't that be transferred to ITG in some way?
It would be an interactive foreground. Every time you hit an arrow with the proper timing, the character in that row would attack. At one point, it would go to summon mode, just to make reading the chart harder, at least for some people, since all the notes would be on the same line.
It's just a rough idea though, and I don't know how hard it would be to pull off, while making it look good.






