Also Unigine said something about an mod-sdk for Oil Rush.
It was mentioned on their pages. Now everything is gone:
Maybe in some distant future …
Unigine is know for bullshiting around. Oil Rush was suppose to be supported on linux but only steam users had access to multiplayer lobby for example. There is interOS lobby now, but no one plays it anymore. There was talk about story and character development, yet the story doesn't exits (almost). This is the company which makes things even worse - making promise to Linux world and failing in every aspect. I can't wait for Unity3D and SourceSDK to blow them away