Last Month the Japanese try to retrive this mod a little bit more. They played in the at 2pm CET. At the moment the gametracker,com Server Monitorring is off. Hope soon they turn it on. The ranking seems to work.
I took a look at the Defgun code, and apparently it has no seat object, but it still has an entry object and everything else. Try doing a beginrem/endrem on the addtemplate seat bundle in the vehicle's complex, if that doesn't work, I'll take a look at altering the seat object itself.