I'm expecting rather poor roll response due to sheer size and related inertial problems, that top speed is only 320mph from it's 2800hp also indicates a rather high drag coefficient, meaning it will zoom poorly, accelerate poorly, lose speed perhaps even faster than the brew, and add in induced drag from the turn, it will bleed E like a dump truck. Also of note, it's out climbed by the G4M.
Assuming combat weight of 20,000 lbs, wing loading is 39.76lbs/sqft, compared to the Me 410's atrocious 60.82 at max takeoff weight, and the Ki-43's excellent 27.99 at max takeoff weight. At typical weights, the Ki-43 has a wing loading of around 23lbs/sqft. In other words, the Beaufighter is right about in the middle of the spectrum. For comparison, a K4 with drop tank only has a wing loading of around 46.7lbs/sqft.
Don't get me wrong, it might be a moderately successful BnZer with that gun package (for a pass or two any way, with only 60rpg), but it's no hidden gem.
Your assumed weight is 4500 lbs over the empty weight. Most of that is fuel. Empty, the wing loading drops all the way to 30. Nobody will expect that on a twin. I agree on the drag, btw, but I'd be willing to bet that this thing's corner velocity is fairly low. What I said was that, low and slow, this thing will be a bear. I don't think it'll make much of a boom and zoom a/c. The speed is too low - but at a quarter fuel or less and at low velocity, this thing will be quite dangerous, given its snapshot and point ability. In that sense, it is like a twin Brew, not a danger unless you're also low and slow.
Otherwise, I stand by my original comment that the Beau will only be a danger in a similar way that the Brew is. Remember, the brew doesn't have one of the better k/d in the game. I would predict the Beau will be a similar threat and have somewhat attenuated threat potential as a pure fighter. Otoh, consider that a Beau can come in heavy, tool shed everyone, and then fight on the way out in a manner that many attack aircraft cannot.
As for roll, I'd need to see the inertia numbers but the engines are spaced quite closely to the roll center . The ailerons, however, stop well short of being "full span". This just in: the roll rate is indeed low-70deg/s.
Mind, I never said "uber" . I just said it will fill the bill.
Guess we need a few copies rolled out to see whether it will be a legit mudder or just cannon fodder for the faster birds. I note there is a war thunder forum topic on the Beau scourge, but this is, of course, highly dependent on the wt model.
In any case, I don't think I disagree with much of what you said. It Will be shot down in large number ( name the ah aircraft that isn't). However, I do disagree with your assertion that it might be a good bnz or that it won't be an ankle biter. It'll be an ankle biter that takes the whole damn leg, given the right e state of the quarry.