Br!cked are you saying that glitch is the only ICS kernel that will mount and install apps on datadata on initial flash of the rom? If I choose to slipstream Devil kernel or any other ICS kernel in to the RC1 rom zip will it not mount and properly install in to datadata, but instead use the slower data\data partition. At that point would I need to flash MP's datadata script right after flashing rom zip in the same cwm session in order to use datadata instead?
You will probably need to let the phone boot once before running the data fix, unless you have another addon cwm zip that creates some things in /data. I made myself a basic addon package that has things like TB, JuiceDefender, etc.
So, I can, for example, simply install a custom slipstreamed rom, then basica addon, then data fix, and I'm golden.