Before I jump in, I'd just like to say that I personally enjoy using mods in games. I think they can expand the experience and add stuff developers forgot in a released game.
But that's the rub: TiTs isn't a fully released game. At least, not yet. If anything, its some strange evolving creation that constantly gets updates and tweaks to run better and better. And on top of that, the community is allowed to design and submit stuff, kinda like tiny mods that will be added to the games content.
Except they are permanent. So any little 'mod' that the fan-base creates will have to fit with the overall theme of the game. Which is where everyone at FenCo and the ToS come in. Adding a 'mod' like the one suggested is basically like playing through Skyrim and having just ONE dragon be Randy Savage. Its an extreme example, but that's the closet equivalent I could think of. Its a jarring break from the precedent set by the rest of the game, and on top of that, why is ONLY that scene like that? And not the others?
Because the game isn't built that way. Maybe, when TiTs is done (Finger's crossed), there could be mods you could install and remove, little addon's to tweak it to be the perfect game for you. But the Dev's are painting with a broad brush, and we, the fans, get a smaller brush to help fill in the white patches for them. We don't need people sticking extra sheets of paper onto the canvas and saying how much it adds to overall experience.
Because it just doesn't. At best, its niche, and worst, its redundant or contradictory.
I don't want to come off like a dick here. The idea of a scene itself isn't bad, and expanding on interactions with the other residents of Tavria's palace is a good idea. But playing through a bad end doesn't make sense in the context of that rest of the game. A bad end is just that: a bad end. Its the end for that character, time to start again. For one scene to just go 'oh, you hit a bad end, but don't worry, you get to keep playing' is contradictory to everything else that is currently written.
... I realize as I write this someone could respond with 'well, we could just add playable routes to all bad ends!' I pity the soon-to-be corpse when Fen&Co find them.