All images in posts are scaled to 1500px, regardless of the size limits. I thought I wrote that somewhere, but who knows where.

Images in posts are generally intended to be viewed in the post so allowing images much larger than fits in a post is generally a waste of bandwidth, and slows down page loading.

There's nothing wrong with putting WIP images in the gallery though. You may wish to have a separate album for them.

It's more about the tone of the settings than the colors of the map. Just think "the world is not a happy place" and adjust whatever you need to accomplish that. Ruins, war and conflict are all central elements.

Not really. The main important points for me is that it is correctly scaled and only include the "approved" artwork, the rest is handled my my macros.

I get the 'zoomed far out' behavior (looks like the zoom is set to fit the default 1000x800 map size, and don't zoom in automatically to the smaller template), but not any other issues.

You'll probably be able to fix it by editing the actual template itself, set a snap grid there and save it.

Works perfectly fine for me too. And I checked the source code of the website, the link is as a plain standard link as they gets, no fancy javascript or popups or confirmations or anything weird that could potentially fail, it is just a link straight to the file.

I would recommend you try a different browser.