[2019] I don't really care about bigger islands or more memory, but please fix island border issues...

I'm using the Shoreline island to make a mini-BR map. It's mostly going fine, however:

The island is larger than the border.

This is also an issue on the Caldera island, it may be an issue on others but i'm not too sure. When the Shoreline island was added the border was smaller than it is currently (so they have made it larger), however it's still smaller than the island itself.

Basically there are parts of the island landscape outside of the border, which is a problem on gamemodes like BRs that tend to use the whole space. Firstly, it means I can't build on some parts of the island, but also it means that players are likely to end up outside the border when playing (thus potentially ending the game early).

Also, this part isn't as bad as the wall borders, but in Shoreline (maybe some other islands too?), some parts of the ocean floor are under the bottom border. Not a problem in most cases unless you want to build something on top of the water (in my case, a pier). This is more of a visual issue in that case, though, as the player can't get that deep underwater anyway.

I'm not bothered about bigger islands right now, but please fix the border sizes of islands we currently have.