First thing's first... Awesome game. Buggy, but still pretty damn neat! I've been a flight simmer since 1994 and always wondered if there is going to be a ship simulator one day. Until last night, when I found shipsim 2008! Almost 14 years late, but it's finally here. Howcome I never heard of the 2006 version is still a mystery to me, though! Maybe because Ship Sim community isn't as huge as flight sim. So I'm going to base my suggestions on what I have learned from FS over these years...
1)
Complete freedom of design for 3rd party artists. This includes ship/scenery/dynamics artists. Anyone with enough knowledge should be able to modify or design textures and models. From floating tubes to giant cruise liners to oil rigs. Reason is simple: the more i can costumize the game to my own liking, the more i will play it and the more I will talk about it!!! I would have spent 5 hours instead of 2, if I was able to replace that P&O logo with "biggest spammer on the net," if I knew how to edit skins. (I know about the ship editor... I'm just saying...).
2)
Customizable traffic. Last time I was in Southampton, I saw more boats and ships! It'd be great if users were able to add/edit AI trafic.
3)
More accurate sound system. Including different wind sounds, etc.
4)
Antarctica/Arctic ocean. Do I really need to explain why?! Though, this is going to need a whole new dynamics engine. But still, I'm sure it'll be very popular.
5)
Calais/Dover routh.
Hmm... That's it for now! Of course, navigation and autopilot options that were mentioned before would be great too.
p.s. Regarding the "biggest spammer on the net," and P&O thing, I once registered with their website to buy a ticket and since then I haven't been able to unsubscribe!!! I even telephoned them. No luck. Blocking was the only left option. I'm told I'm not the only one.