Gentlemen, this is really a silly argument...
Virtually every aircraft in this game has a recommended limit on MIL/Takeoff power. For example, real P-38s were restricted to 15 minutes max at MIL power. Aces High has no such restriction. You can find similar restrictions on every U.S. aircraft. Both Yaks can fly around at max power until the fuel is exhausted. Is that truly realistic? No. None of these restrictions are applied in the game. Why? Because the emphasis is not on systems management. The emphasis is on game play. So, you want more realistic systems management? There's other games that provide that, at the expense of game play and usually accompanied by piss-poor flight physics. Then again, in combat, a pilot will push everything forward and not even think about it until the danger is passed. Recommended time restrictions be damned.
Moreover, I don't understand why there is so much angst about the Brewster. Even without MIL power time limits, it's still among the slowest fighters in the game (if not THE slowest). If you're getting getting your butt kicked by Brewsters on a regular basis, a little introspective thinking is in order rather than whining about further limiting a bog-slow aircraft even more. In short, maybe you make poor decisions. Maybe your SA simply sucks. Maybe you lack the basic skills needed to avoid being eaten up by slow, but maneuverable aircraft. Whatever the reason, Unless HTC reviews every aircraft and adds more complication to engine management, what you see is what you will continue to get. I doubt that HTC will change this for the reasons I defined earlier.