Steam Extension?

So my Game Space Corp Tycoon was recently greenlit, and im not working on some of the steamwork stuff which has brought me back to this forum :D

I read some other threads stating that a steam extension does indeed exist, but only for developer versions, I have contacted chris through his email but have not been contacted back this was last week.

Just wondering if i am doing the right thing emailing him, or if their is another way to obtain the fabled extension.