The problem in any historical game is how do you deal with the US, since it has only existed as an independent country for 232 years, which is a very short time compared to Europe. The Dutch ares somewhat similar, dating from their revolt against Spain in 1568. For reasonable accuracy, probably it would be best not to include the US in the Age of Sail. Finland was under control of Sweden and then Russia, as was Estonia, so it would be better to have Sweden and Russia in the game. The Ottomans were in actual control of Arabia, so they should be there instead of the Arabians. The Chinese could have been a factor if their leadership had been different, so you could include them, but the Japanese pretty much walled themselves off, so you would not have to include them. The shipping of the Indians was pretty much in the hands of the Arabs, and if you wanted to include the Arabs on a historical map, you could base them in India.