Wouldn't what you want then be turn based and not any form of atb? It sounds like it. In my opinion atb shouldn't be used in rpgs. But the X-2 system is awesome.
Anyway the new system is the better than before. Its fluid and the charecters change positions on the field. I still found some flaws in it though and if square is gonna use the same system then I hope they fix them. But the flaws are pretty negligible.