We already have map editor and you can download from site. Second (built in map editor) is in development. Realistic grass has impact on performance. And adding few grass blades here and there will not look better than without grass.
Also, I've gone to download the map editor and there isn't any obvious way to. How do I download it? Also, are the buildings props or can you actually go in them? If you can go inside it, it means the recon class could be far more useful.