Well I guess people aren't blind and can see that there is a lot space in the water to add something. But it takes a lot time to create a map and it's textures. We got a very small developer team, especially when it comes to modelers that are able to create a map extension (Venom only I guess). Also he was busy with the URL Speedway and new Los Santos Airport, which will get added when the URL System is done. I think he will do the tuning parts for the missing classes now.
///