Viper has the strong ability to hold angles but nothing like brimstone omen and other agents, this really gets rid of vipers use so I propose an idea that doesn't sound to bad!!!
1) Let viper pick up her wall but only once per round
2) Let viper not lose or gain fuel when standing still but only when one of her fuel abilities are being used when both are being used let it both of them decay but only at 1x fuel decay not 2x like atm