Since everyone is doing modifications on PS3 EBOOT ELF files I have released a simple Auto MOD Tool and Auto PSN Game Creator application which will do the editing, creating, and signing part for you.
Download: Auto MOD Tool / Auto PSN Game Creator v0.2.1
I have no time to write proper tutorial so just quicky:
1. Get your DECRYPTED EBOOT.BIN (tut HERE)
2. Put game ID to game ID field
3. Browse for needed files (there is no check so be sure u selected all)
4. Slect the Game folder and disk drive (8 chars only, hdd0 it should be)
5. Select the FW version
6. Click on EXECUTE
7. Watch how all it is done for you
Note: Path to game in the PS3 it is always: "dev_[selected drive]/[folderGameName]/USRDIR"
fix some bugs we gonna find
Please test it as I never did it properly and post feedback!