One of the options we were considering, but did not get time to implement is to set the pixel width of zero width lines.

We hope to implement effects options as a percentage of the map size as an option, which would overcome some of the issues Joe mentions.

The reason we put in the true image size is because the CC3 export resolution is limited by your system, to be precise it's limited by Windows GDI. It's almost impossible to tell on a given system what that limit will be; it depends on graphics drivers in the main. My very old XP system does 6000x5000. Anti-aliasing requires large image sizes to be effective - 35% is about the minimum useful and noticeable value. So, once you know what your system can handle you can create an anti-aliased setting which can throw what you can handle at it.