Here is a suggestion
It would be nice to have some new maps for Onslaught and Capture The Flag Make'em big outdoor maps and NO Custom Maps so the user doesnt have to downlaod humungus files to play the maps. Just use the Default Textures and Meshes ETC ETC. Here are some pics of maps just using the Default Textures and Meshes ETC ETC and they look awesome from Tribes2. And you can see thousand of maps just to get some Ideas if you want cant hurt.
So you can check out http://www.tribesmaps.com
if you want to get some addinonal ideas if you want. They have thousand of maps that may inspire you.
here are some pix for some ideas.
And all these maps were made using the default textures
and Meshes and other default info.
These are just suggestions!!