I so far love the game, but I'd like to add some features of my own to it. Mainly new ports and small personal additions. Would there be a app that would be able to do this? Or will this be unavailable?

Ports I'd love to add (not in any specific order aside putting it per country):

Norway - Svalbard
Norway - Kirkenes
Norway - Bergen

Iceland - Reykjavík

Faroe Islands - Tórshavn

Ukraine - Odesa
Ukraine - Savastopol
Ukraine - Mariupol

Japan - Sapporo

USA - Anchorage

Mexico - Puerto Industrial Altamira
Mexico - Puerto de Acajutla

Panama - Panama city (Port of Balboa)

Probably a few others that might need a add