It's not the cas files, it's the sprites. The only thing you can do is comment out the sprite models in the descr_model_battle.txt file. Then the textures will always be used.
One caveat - some say that commenting out the sprites cause the units to be "invisible" at long ranges. I have never experienced this, so I think it might be something to do with lower end computers/settings.
Anyway, to comment the sprites out nice and fast, open the descr_model_battle.txt file, select Edit>Replace, then put "model_sprite" in the find box and ";model_sprite" in the replace with box and click replace all. Save it and you are in business.
Make sure you backup the file before modding it.
Bookmarks