Seems to be a bug here. I've requested the menu file to be updated, but meanwhile, to access the symbols via the catalog buttons, type in SYMICONFLOAD on the command line, and pick the WWII option from the list.

Thanks for contributing another great map Quenten.

Map is now in the atlas. Thanks for the contribution.

Looks like you are off to a great start. Make sure you deal with the repetiton in the textures, either by adding details that cover it up a bit, or changing the texture scale a bit.

While everything is technically possible, I am not very likely to add features that are not available as an add-on. There are a lot of various requests for all kinds of potential improvements here now, but all of those means that I basically will need to write a new plugin myself.