I'd love to have this option. I'd like to explore biomes as-is, but also have the option to switch to Safe Shallows transparency levels if wanted. (Would be nice to appreciate the whole environment from a …
Seabase teleporters would be very useful. To avoid a 'fast-travel' feeling, the developers could always limit the use. (Maybe you can only travel once a day, or it requires a specific set of resources to use, etc).