First, load and apply the Mars color setting

Then, go to the Altitude tab of the Lighting and Color dialog, here you can set blue colors for the sea. Just set the sea level and lowest depth color, FT3 will calculate those in between, and you'll probably want to bump up the value for number of colors too.

Not easily unfortunately. Would have to figure out how the plugin that provides that functionality works and rewrite parts of it.

They are, it's just less noticeable because they are broken up into individual letters.

Just posted a new blog entry about the screen.

I often get maps for the community atlas where people haven't properly expanded the screen to cover things that end up outside the map border, so perhaps this is a good read for some.

It is the same catalog, minus the borders drawing tool. Since cartouches doesn't have it's own button on the toolbar, it isn't uncommon that Ralf takes these symbols from it and throws into the border catalog for easy access. The border catalog is usually quite small anyway, so combining them usually works out fine.