Hey this is extremely cool and a very helpful tool. Will definitely consider supporting the project. Thank you!
I do have one question. Is it possible to update the icons on the map to different things? I saw a post showing some different icons earlier but can't find it and also I wasn't sure how I might import them to the tool
No, it's not possible. The generator doesn't use any pre-made assets (and can't import them), everything is drawn procedurally.
Are you asking about cities? All you can do is to choose between "pins" and actual icons (Details > Towns), change their size (via the Style dialog) and slightly change their look by rerolling internal parameters (Details > Towns > Random icons).