Your plane stays light for a longer time as well.
I understand what you are trying to say and if a player wants to train with 1/4 tank of fuel then that on them.however I usually tell the players I'm working with to put a certain amount of fuel in,usually 1 hours worth at a minimun as thats the length of the lesson.
You can spin it anyway you want but the fuel burn at 1 will allow more time flying and less time wasted.
As I said if it's so important to you make a custom arena and set the burn rate to whatever you like but as long as I'm a trainer the burn rate will stay at 1 in the TA.
