No. This is idiotic. You are forgetting that AH planes are already gifting you burn time (fuel burn is fast!). If you need that extra wee bit of weight gone in order for you to think you have an advantage... you're doing it wrong. This ranks right up there with emptying the rear gun on a 110 to "make it turn better". **facepalm**
Aircraft in WW2 didn't go up with less than 100%. Period. I can show you my g'pa flight logs, fuel was always 100% in the south PTO. B24D, C87, C61, C78, B17E, C47, C45, etc.
Fuel dump is as gamey as they come. I actually think HT is being generous in letting the Lgay7 and Spit16 fanbois take up 25%. Be thankful.
Thankfully this won't go anywhere.