GUYS!!! I was able to make White Knight Chronicles (BCES) work correctly with cutscenes!
I don't really know what the key was, since I tweaked some stuff in a bat file I downloaded from here (like changing self-type from NPDRM to APP and signing with FW version 3.55 instead of 3.41), and also used the recently released scetool 0.2.8, but there it is:
http://www.mediafire.com/?osfew99w7sahb8h
As always, pass: ps3hax
Working from external, no parameters, no patch (it's the eboot from game folder)
PS:
Here's the scetool instruction I used if someone is interested:
scetool.exe --sce-type=SELF --compress-data=TRUE --skip-sections=TRUE --key-revision=000A --self-auth-id=1010000001000003 --self-vendor-id=01000002 --self-type=APP --self-fw-version=0003005500000000 --np-license-type=FREE --np-content-id=%~1 --np-app-type=EXEC --np-real-fname=EBOOT.BIN --encrypt EBOOT.ELF EBOOT.BIN