I finally got CWCheat to work. What I had to do was, instead of adding "/kd/cwcheat.prx " to flash0:\kn\pspbtcnf_pops.txt, I used "/kd/cwcheatpops.prx ". Now I can hold Select within a PSX game and get the CWCheat menu. I imagine I could still add "/kd/cwcheat.prx " to the pspbtcnf_pops.txt file as well, but I haven't tried it.
And for anyone who wants to play Disc 2 of Metal Gear Solid, here's the method I used:
http://forums.maxconsole.net/showthread.php?t=43215
You don't need to export your memory card file at all -- CWCheat fools the game into thinking your save file is from Disc 2. Cheat B worked for me. Remember you have to exit the Snowfield to the south and come back before exiting to the north.
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