Bluntly, no.
Not without a much better documented use case for this patch, along with tests and some sort of indications that the author (or someone...) will maintain it. Right now it is abandoned, and doesn't even apply any more.
This patch makes fairly deep changes to the NAT code, changes which I currently do not understand and do not have the motivation or energy to study. If it gets committed and breaks something I'm going to be the one who has to fix it, so ... no, not unless someone can present a compelling case that this actually improves anything, that it is correct and that if there are issues they will work on them.
From the freebsd forum,I guess the pfSense guys can make it ?