Starbase Ship Assist

I was a GalCiv fanatic back in the day, and I just picked up the ultimate edition on Steam, so I'm trying Twilight for the first time.  Starbase ship assist modules work differently than I remember - +1 defense to all ships seems to add +1 defense per fleet instead of per ship as I remember.  This, naturally, led to widespread chaos and destruction. Is this a  real change? Or do I remember wrong? And an ancillary question: is there a concise description of the mechanics changes introduced in Twilight? Thanks!