I've been meaning to try Amiga modem games (firepower, stunt track racer, etc) using that method at some time. I do know someone else who got one of these adapters.. I just have to get the time... ;-)
This is probably a long shot since the post is so old, and sorry for going off-topic here, but Desiv did you ever get a chance to play any of those modem games over the internet with the Lantronix MS100?