Midnight,
I believe this suggestion has been made before. One frustrating part is when you've at a field with say only 25% fuel max and then you switch fields and launch there it gives you the same 25% fuel. BUT, some people don't like to fly with the max about available for certain missions. For example, I don't ever fly with a full load on bomber missions. I just don't need it and I want my plane lighter. Also, for point defense of a field I'll take maybe 50% max. Again, I don't want or need it and would prefer a lighter plane. So, the problem is how does HT solve your problem yet not create a new one for other players who set their fuel to the mission. I'd say that a limited fuel situation is more the exception than the rule.