Figured I’d leave my experience on the hack. Overall, it’s definitely questionable with some of the changes (iron walls in particular were a real nuisance, as was the magic seal spam near the lategame) but it’s still enjoyable. Played it through with a friend up through the campaign and it was really fun, though I doubt that you intended for someone to just put all the numerous stat boosters the two generic soldiers that you get and steamroll a good portion of the game. The postgame, however, felt extremely grindy with no real purpose, as the superbosses with all capped stats were either trivialized by a maxed out Myrrh, or left up to chance, as with the ruins superboss.
There were a few bugs I encountered as well, namely with a few promotions. Ephraim’s promotion into Divine after declining his promotion after defeating Orson was bugged, preventing him from getting any of the skills he normally would have gotten on promotion, as well as his level capping at 2. As well as this, the Flare staff retained its usage as a warp staff (was this intentional?) meaning in the lategame, it was incredibly easy to skip past the last few chapters.
Overall, though, this was a fun way to go back through the game, with enough changes to warrant playing it.