More fuel is easy on the Armors=( ABILITIES[0]=eAbility_Fly, <snip> strName="", iType=eItem_ArmorArchangel, <snip>, iFlightFuel=6, <snip> ) line in the DGC.ini change iFlightFuel=6 to whatever number you want. A Mobility Bonus that only apples while flying is not something I know how to do.