Awesome, I hate having to pick when I turn my game on. Mild annoyance, but this is still helpful!I made a quick and dirty hack. This is a version of the CPS3 Multi BIOS that loads automatically all games in Japanese Verrsion without waiting for you to choose. I made also one for USA.
@Mitsurugi-w tested them, but feel free to report if you try them.
USA Version
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http://www.mediafire.com/file/qy2548e23pm4su1/SuperBIOS_for_custom_SH2_USA.7z
http://www.mediafire.com/file/3bdwbq2wbzfvta2/SuperBIOS_for_standard_SH2_USA.7z
Japan Version
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http://www.mediafire.com/file/aq4k34mm3v342pn/SuperBIOS_for_custom_SH2_Japan.7z
http://www.mediafire.com/file/5jamvv221ntwdmi/SuperBIOS_for_standard_SH2_Japan.7z