Ability to change water level of dimensions

So, at least for Surface-type dimensions, you're able to change the water level by going into the code, finding "sealevel," and changing the number next to it (default is 63). I've seen previous things about this, and I tested it, it does actually change the sea level, I made an ocean dimension with the top of the sea at Y 200. So I'm just asking for the ability to do this without locking the code. Thank you for reading.