Is it possible to add a game mode that does not allow to position a boat right next to another?

[Acrobyux]

I tried this, but works with several bugs, the ships disapears.

And I have not modified what is necessary for the AI to position the ships and the others functionalities (as AI attack and random-placement button.
Can you tell me what I must edit to get that 'game mode' ?
(don't allow to place a ship right next to another)