[akdavis]

That's it. Thx mate, even the dispensers hang below the wings, the doors need to be opened.

Maybe there are bomb bay doors in the dispensers so the balls of fire dont pour from the pipes before you are over target.

I think it is just that the sim considers it a submunition like the PTABs, which requires you to open the doors on the Il-2 (not historical, I believe). Although the VAP is external, it is not a droppable munition.