Very interesting mod! I do think the main problem this mod attempted to fix was already resolved by RSCompat, specifically in that all planetary routes from the starting planet are marked to be retained (though this wouldn't prevent the nauvis-vulcanus route from being removed when starting from a non-Nauvis planet)
This also preserves the 'spider-web'-like effect that RSC has on the game, preventing overlapping routes like the one shown in the image (that defeats the purpose of using RSC entirely imo)
That being said, giving the end user a way to modify which routes they want to retain is quite an interesting concept.