I was thinking that the power supply recharge may come into to play as a constant; for a 2.0 refire weapon you have a power "impact" of PwrUsgPerSec-RechargeRate(0.5) where as for a purple goddess, you would have a power impact of PwrUsgPerSec-RechargeRate(0.03)
This wouldn't be as useful in balancing as it would in picking weapons for personal use. Does anyone know if all power supplies recharge the same number of power point per second, and if so, how many power points per second do they recharge?