Entities on water?

[ficolas]

I have posted lots of modding help things recently :S

But well, is there any way I can place a entity in water, or half of the entity in water (like the pump)?
I dont care if the entity type is a pump, but I dont want it pipe conectable, so if I make it a pump, it wont conect to pipes because the colision box is different, or something.

[kovarex]

Collision mask (set of values specifying what can be placed where) are now part of the prototype and hardcoded in C++.
The specification could be moved into the entity prototype, so players can change it, we will do it (soner or later)