Something I'd love to see for the next Gehn shard update is the ability to switch out sfx files with custom music/sounds without the game crashing or redownloading them. I have a whole slew of tracks I use in my CC version of Uru mostly of fan compositions, also I use the Riven link sound in lieu of the Uru one (which is infinitely better.) I requested this for DIRT which Chloe said was pretty easy to do. Some of those Uru tracks get really grating after so many years, plus I like to use tracks that feel more D'niesque in places than the originals.
This would allow people to custom mod their own soundtracks.