You don't even have to use drones as ammo.

Check out vehicleunittypes.txt; you can add your own unit types.
As for generic drone launchers- just look at the existing one. Should be easy enough to figure out from there.
With the EB Games version, I had to move SE5 to the correct directory, uninstall, MANUALLY delete the SE5 folder, manually delete all registry entries, and reinstall. Moral of the story: don't mark SE5 files as read-only.
