Hi,
Our SMEs confirmed that mixing AG weapon is possible as long as the load-out is symmetrical (no 530 and wing tank) and you don't mix the 530 with AG weapons. But as said previously, no mixed load-out are "cleared" for the 2000C so IRL, it is never done.
We can't add limitations that are not present in the real aircraft to force people to use "cleared" load-outs but we will talk about this in the updated manual and only provide "cleared" load-outs presets.