Not sure if anyone has brought this up, if so please direct me to the correct forum, but from what I can tell, shield efficiency doesn't affect recharge rates, but in fact the amount of warp-power the Shield System uses. The higher the efficiency, the less power the system has to draw to work at peak-strength, allowing more power for primary and heavy weapons. For example, I messed around the with the Shield-X efficiency, raising it from 3.0 to 2000.0. I thought that increasing shield efficency would simulate regenerative shields. Not so. It simply means, that a shield with a higher efficiency needs less power to operate at optimal strength, than a shield that has a lower effiency. This is very useful for a ship like the Nemesis refit Enterprise-E and the Defiant which both have substantial armaments. The Enterprise with 14 Type-XII phaser arrays and the Defiant's power-hungry Pulse Phasers, would benefit from a shield system that doesn't draw as much power and would allow that power to be used for increased weapon capabilities. Anybody else have any thoughts?