The only way to make your games smaller without creating a whole different compression scheme (of which there are no others currently for pops as far as I know) would be to rip dummy files if they are present in your image or movies/music. If your game has a lot of movies you can save a lot of space, but to correctly rip them out of your game is a long and tedious process of which I have detailed my method on this thread:
http://www.dcemu.co.uk/vbulletin/sho...t=48714&page=2
Other than a different compression scheme or ripping dummy files/movies/audio, no there is no way to make your games smaller. Hope that helps answer your question.
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