Right, but I want to wipe all user data too. Can CWM do the same thing that the ODIN OneClick Master Clear did?
master clear is not necessary.
in CWM, if you select:
wipe data/factory reset
that will wipe all of your /data and /cache partition
you can format SD card also, but it is not needed.
there is nothing outside of /data, /cache, dalvik cache, and /system that could 'mess' with your newly installed rom.
/system will get wiped when you load a new rom, and every rom script should include formatting dalvik-cache as part of the procedure. wiping data should be up to the user, because if moving from version 1.2 to 1.3 of the same rom, there should be no need to format data.....
the cappy (GS1) was different. the one click to stock was to reset the partitioning scheme that voodoo performed and to set the filesystem back to factory for the next rom flash.
with the GS2, samsung realized that RFS was a horrible filesystem and they went with the standard EXT style formatting. one click and master clear are a thing of the past now. you can try to justify the 'want' for a master clear, but i can assure you, nothing is lingering that can jack with your flash