Was thinking that it is too easy or lacks a bit of skill just hammering away at the boost or fire buttons. Why not have a slight energy penalty for pressing boost/fire before the engine/weapons capacitors is properly charged. For example a premature boost would knock two or three bars off the engine power, making it longer to recharge. This would making timing of boosts/firing an important skill in critical situations. The capacitor could change colour indicating whether it was charged or not to help players out a bit.