You can customise the loading screens they are located in C:/ program files / The Game Creators / FPS Creator Reloaded / files / titlesbank / Default
The loading screens are located in folders named as 1280x720.....1280x800 etc and are individually named .....about.jpg, end.jpg, loading.jpg, and title.jpg
Of course the Steam version will have a different path but this will help you get to grips with the current structure..
Also the intention for the future is to incorporate an editor for doing exactly this
EDIT.... So I don't make the mistake I made earlier you would have to alter these BEFORE you compile your standalone game
Sound Zones can be setup so if you walk into a room for instance with Zombies the music can change to your desired choice...
The only person ever to get all his work done by "Friday" was Robinson Crusoe..