I'd love to see a thing that allows you to change things on fly with a possibility to be exported as a mod. Like, a mod that have another «slave» mod where it stores its settings or something.

Ideally, it would be great to be able to catch some errors so player could offer his own solution. Missing texture? Okay, what shoud we do: delete the thing altogether, swap the texture with another one, ignore? We all love these purple squares, right? Or you see a hat that you really hate, but overall «What's that mod» tells you that modpack is pretty cool – you just don't like this specific item. Or maybe you like it's stats, but want to replace its texture just visually. Or you have a bunch of mods that made their own researches here and there and you want to consolidate them somehow?

Such mod could depend on mods like «Cherry Picker», «Configurable Techprints», «Resource Dictionary». They already do most of the things described above, but I'd really love this process to be more steamlined and exportable (with «remembered» dependencies ideally and its own options, so a user, a friend or future you could disable some tweaks).