Two minor things actually:
1. How do you capture triremes? Because I just happened across the official feature list promo of Hegemony and the last line says: "Conquer the seas - Build or capture a fleet of triremes to protect your coastlines, raid enemy merchants, or drop an army at your enemy's backdoor.".
Having played through the game I can't remember a way of capturing them, but it'd be a really nice idea. On my playthrough, I chose not to expand eastward until the entire greek mainland to the west and south of Pella (including the Peloponnese) was mine - didn't want to open up a new front to the east while facing constant attacks from the south.
But I do recall wishing I had a couple of triremes to take over some island cities I was forced to leave behind due to a lack of passage. If you'd gain control of the the triremes docked in the cities you capture, this problem would be solved. It could even be a nice touch as you'd have to take very good care of those ships until you take Olynthus.
2. On a related note, there's a mission to destroy 30 athenian and persian ships. If you say capturing docked triremes is a bad idea or can't be done, wouldn't it be nice to at least consider them destroyed instead so they give credit towards these missions? Because right now, they just vanish. ;)