Our B-26 already has blister guns firing forward (you have 4 50cals fixed forward) as well as a flex mount.
I don't think you even know what we currently have in-game! Do you even fly it? Why are you requesting it?
There is only 1 version of the B-26 that would ever need including in this game, really. The one we have. If you added the B-26A it would have a fraction of the defensive guns we curently have.