Well, I would like to have more navy and fishing vessels, but as long as you not can "fishing" with fishing vessels and do anything specific with the navy vessels so is there no meaning with more vessels in my opinion. The reason that I say "more navy vessels" is cause there is already two navy vessels in the game. The US Coast Guard vessels are in the reality just navy-vessels. So instead of more ships, give every vessel their own specific way of use. Like today so can you create a mission and put a rib in a mission where it should be the cutter, or a fishing mission you can use Vermaas, there will be no difference, cause the fishing is only happening in the players fantasy.
Finaly, Virtual Sailor is the old version of that serie of games, it is like SS206/SS2008 and has not been updated sinse mid 2010. The new version of that game is Vehicle Simulator. Which one is best, Vehicle Simultor or Ship Simulator Extreme has been discuessed many times here, but it finaly goes down to what you personaly are looking for. If you like a freeroaming simulator where you can sail around the world with simulated instruments so is Vehicle Simulator better. But if you prefer missions where almost no instruments are simulated and have realy good graphic so is SSE better. There is also a lot of add ons for Vehicle Sim, some payware which have much better qualities than SSE-ships have. Virtual Sailor have a bit of bad reputation of having bad graphic but the new version of that game is much better than the old Virtual Sailor.