It would be nice if rivers could have a more variable width, and become a bit smaller. I can take a stab at this if you could point out where river width is handled- this can be handled with a config file as well to limit min/max width.

Hey, thanks for the request! River Redux uses the vanilla biome generation system, which unfortunately doesn't really accept min/max width settings like that. The most you could do is make the rivers larger or smaller globally, which I aim to add support for in a future update.