Registering pre-Steam GSB on Steam


I bought GSB 2 years ago (on BMT Micro Orders) when it wasn’t on Steam. Is there anyway for me to register this copy on Steam (for Linux) now?



[size=25]to my knowledge[/size]

Assuming the creator read this, couldn’t he issue me with a Steam key?

This would be something that I’d be interested in getting also. Since i lot of my freinds play steam maybe seeing how much i play it might get them to buy it also.