System which would allow people to keep a ct store and allow them to go back to it incase they rolled something terrible. 

Example: Maple has cursed speech. He saves this CT and rolls kaori. Maple hates kaori ct and rolls back to cursed speech

How to stop everyone from just saving better cts and progressively get stronger and stronger? The roll back does not allow back to back saves

Example: Maple has cursed speech saved. He rolls yuta. Maple can't save yuta because his save slot is taken up by cursed speech. the only way for him to free the slot is to roll back to cursed speech (causing him to lose his yuta ct)

After you roll back to a saved cursed technique you can not save that same ct again

Example: Maple rolled back to cursed speech from his save slot. he can't save it again.

Just something that would not be too op but would also allow players with decent techniques to still roll without fear of becoming junpei