Dual throttles provides no benefit for the Me410. Only in areas such as spin recovery or super-rare maneuvers like hammerhead wingovers (though I doubt the 410 can even do such a move) would the split throttle help. Split throttle doesn't stop torque. If you throttle back the inboard wing in a turn you lose that extra lift and stall out faster. It's detrimental.
As it stands now, the mosquito is by and far a better fighter than even the lightest 410 loadout. It's just the way it was modeled. However, kill-death ratios in the MA don't mean anything in regards to this. That's entirely subjective and not a controlled test. You can see this, however, by simply flying both regularly. One of the benefits of flying with Batfink is he draws you into the Mossie once in a while. I've got quite a few 8-kill sorties in the mossie (no reloads) when mixing it up. It's much more capable than the 410 at furballing, though not quite as good as a single engine plane would be.
