Hey Age, trust me, you can definitly Overload weapons in SFC3. why do you thinik people on GSA can literly blow you up in one pass with an Unmodded copy of SFC3. In unmodded SFC3, you can design your ships too have tons of extra power, which will overload your weapons if you have extra power availabe. Just click on the lighting bolt button when your in a game and you will see the bars that indicate how much power is allocated too Weapons/Systems. If power is above the first line, then it says you have a little more power availabe too overload. As for sheilds, I don't know for certain, but with my experience with playing SFC3 it seems that if you have less power available for sheilds (below Minimum Requirement) sheilds that are knocked out will remain knocked out until you can componsate for power too them again. For example, one time I was playing in a GAW scrimage game and my Centaur suffered major power loss. This caused significant power loss too much of my systems. I still had sheilds, but when the enemy attacked me, some of my sheilds went down (AFT and PORT sheilds specifically) and would not come back online. I still have my FORWARD and STARBOARD sheilds functional. When I compensated for the power loss too sheild systems, my AFT and PORT sheilds came back online. Again though, this is just observation deduction, we still have not had a clear response on how Sheilds work in SFC3. They are much different then the SFC/SFB sheild system.
Age, I highly recommend you get the GAW mode. Its far superior then unmodded SFC3.