Reggie, just a note: I don't really see any way *I* can make the thing you want. I am certain Jimi or Orion could, but they're both light-years, nay, parsecs, ahead of me in XML and C++ programming.
I do apologize. All I can see is to have the configurator open, and when you "release" a weapon, just click it off in the Configurator.
The only other way I can see is to assign the Drop Droppable Object key combo (SHFT+D) to a button on your joystick. I am not certain it will do what you want, but you can give it a try. I tried to make it work, but no luck. Maybe you'll have better luck, somehow.
I am sorry, and wish I could be of more help...
Pat☺