The capture mechanic itself in sins leaves a lot to be desired. We are still fighting for control of Borg assimilation. AFAIK You cant flag just one ship or structure as captureable. Its an all or nothing deal. All frigates, all cap ships all structures. Psy would know more about this than i would.
Play Forged Alliance if you want to experience some "chug". First SP mission is a stall fest from the get go.
A lot of the low res stuff came from the original SoA mod. Almost the entire Dominion lineup is from the original SoA mod. The poly counts of the original SoA ships fit perfect into Sins. However the textures are 256x256 total res. We planned on correcting this when we had the spare time, and that time is coming. That is why i am trying to get good 5 views of ships, and working with the Excalibur team.