I have a suggestion for hafen: make the map much smaller. If you think about it, W7 isn't exactly crowded, but it is very big and feels very empty. With the current player base, a much smaller map is very viable. With a smaller map, things like roads and trade routes would be easier to make, landmarks easier to regognize, and walking/boating/riding would be the prime way to get places. Plus, maps might finally be useful... Maybe.
This ties in with my second idea, and the main reason I posted here; I think teleporting willy-nilly should be removed in hafen. While teleporting is an established part of the game, being able to teleport anywhere and trade with anyone from anywhere promotes isolationism. No teleporting, or reduced teleporting (teleporting to your hearthfire is super convinient), would bring trading and traveling to a more realistic standpoint, with distance, delivery, defence, risk and value all being variables, and promote the building of roads/trade routes between established traders and their regulars and villages that trade regularly, as well as between large settlements for convenient travel. It would also add more of a zest to trading, with guards needed to keep the merchandise safe (of course, you could charge more for delivery depending on the distance, or just demand the client comes to you).
A whole new playstyle would open up in the form of drifters who go from place to place on the roads, raiders and thieves who prey on caravans and lone wanderers traveling the roads alike, and caravan guards/mercs (tying in with this, more terrain types and the 3D in haven would promote solo players who can't fight exploring to find different routes between places to avoid big main routes and the troubles they bring). Lastly, it would promote people to build closer together for the benefits trading gives.
The best example of this is Laketown and the area around it in W1, before oath-trading was used

Notice how many communities sprouted around Laketown. Also, notice the roads between them, and leading away from them. This map is like sex to my eyes, and I hope hafen can reach this level of awesome.
With such things as horses, a smaller world, bridges, 3D, more terrain types and maybe a fleshed out road system, the removal of teleportation and the changes it would bring to trading and traveling would only be for the better.
Tl;dr make the map smaller and nerf teleporting