A Full complement of crew for the guns and animations of the guns recoil and loading which can turned off in settings for those wilth low end computers
Rigging damage again with the option to not see this for lowend pc's
Ships names chosen from approved list. the name could be changed if captured but kept in the ships history.
Ships crew, officers, midshipmen which can be killed but also gain xp which influence the ship a small amount
the option to stay in combat mode and sail for as long as you want travelling to those locations at which they leave