I have been using Firestorm in OpenSim for many weeks also. Something seems odd about this article or I am seriously out of the loop. There are two different versions of Firestorm? So far I am using the same one in SecondLife and in OpenSim. Why would Havok, which as nothing to do with SecondLife, insist on limiting viewers that can use it? I am missing something here.
Firestorm has an XML file that you can add other grids to get them into the list. Not as user friendly as it could be of course.
Wow. I just read those sublicense terms. Yet another brick in the wall forcing me out of SL. A great pity as I have a lot of history, wares, and friends there. I will keep a light on, for now. But this is another helping of disgusting abuse as far as I am concerned.