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.
Change it to c_PIAltFire. To prevent unneeded dependency, bring the whole code for just the weapon object itself of b17bombrack into your file, and then change it's InputFire to c_PIAltFire. This will make it fire with the secondary fire button. Hope that helps!