FE4 Dual Stage Pursuit patch

[Sagi]

As the title says, I'm looking for that patch. It allows units without pursuit skill to double-attack if their Attack Speed is higher than enemy's by 6 points or more. Units with the pursuit skill in the other hand, they just need 3 AS or more to double-attack, so the skill still useful.

It's generally used in Japanese hackroms like Binary or --- Keifu, and it would also be a cool feature in our hack. Someone knows how can I find it or how to use it?

Thanks!