Supposedly it's possible to change loadout?

[Bobb4]

I have managed to load the outer guns on the Spitfire with tracers, that is gun one and eight.
Problem is it looks like a laser light show lol.
I did this by selecting plane loadout and saving it in the main setup.
This gives me a tracer firing spitfire online.
The problem is however, every single bullet ia a tracer fired from these guns. I have not been able to create a manual belt which is somthing i would have liked to do. Two standard rounds, one dewit, one tracer and one incendary or AP.
Any help on setting up manual belts would be greatly appreciated