Anyone still remembers the cannon truck? I did an experiment: 10 cannon balls instead of 5, but they have 10 times less weight when inside the cannon, and gain the proper weight when shot. Pros: The truck is lighter by like 1000kg, has more ammo and less recoil Cons: The balls are less stable, deform and shake the cannon Maybe I can release it if I manage to fix these issues soon. But that's a big if, I'm not sure if I'm skilled enough yet to do it.
I've never used that exporter, theres another way to do it just through Blenders scene heirachy. That one mught be easier for you to set up, but i dont know if it includes the billboard thing, or TTStatic export (you just export as .dae)
Yep, that's how I've been doing it but trying to manage multiple objects using that method quickly turns into a mess of conflicting names, I created the exporter above to just automatically handle all of it.