Hello, Praetorius! I've been silently following your project for a few months now. I've played it on normal and hard by myself and normal with a few friends completely unfamiliar with the game.
It's been really fun, and I just wanted to jump in and say you do excellent work.
I think you really succeeded in remaking the game to offer various, meaningful choices, and even beyond that the added depth from running, "strong attacks" and counters and reworking the enemy ai make for a satisfying rpg experience AND action experience that, best of all, has replayability. The removal of grinds helped in that, too.
That's what I mostly came here to say, and I really feel like I should have sooner.
I want to contribute what I can, too.
The Sage Stone (sudden cast ring) consumes MP when techs are used while equipped (sets MP to 0). You can see this happening at 23'45'' in the latest video, #"46-48", of that let's play going on of your mod (coincidentally, they're how I found out about your mod!). You can see Lise's equipment at 25'36''. I encountered this bug myself.
I also remember something fishy about one of the Pedan armors, like it was supposed to have a major drawback only the penalty was bugged or something so the armor was too good. I'll try to provide specifics when I have time.
I'm sorry I can't offer more bugs. Maybe that's a good thing, though!
I haven't beaten the mod yet, but I keep coming back to it and am happy to start over. The worst parts are the things you can't address as you've said like FSTs/Spells stopping all action, no in game descriptions of changes, slowdown and battle message spam and limited enemy tells to work with. The worst offenders are buffs like mind up or power up, had square only made them with like 1/3rd second animations like protect up the screen freezing wouldn't interrupt the game's flow much. Is it possible to just make those play out faster like I do manually with frame skip?
It does make me wonder what you'd be capable of with a team behind you and maybe the freedom of your own game. I think you've got a great sense of balancing challenge and fun. It also makes me think about other games that were so close to being good games that could be made less tedious and more interesting with some modification. I know very little about modding or programming in general, but damn if Sin of Mana wasn't so impressive and such a good time with my friends for being such an old game that it hasn't inspired me to learn how and see what could be done with a game like Final Fantasy: Crystal Chronicles or, you know, Legend of Mana.
Anyway, that's a lot of words and bullshit, so I just want to be clear and repeat. Thank you, Praetorius. You've done incredible work.