I'm new to MIUI--was using CyanogenMod before--and I was wondering if I could move apps that aren't supposed to be moved to the SD card but can be--like in CyanogenMod.
I have an HTC Evo 4G running the newest Supersonic MIUI ROM with App2SD
Hold down "Home". Click "App Manager". Find the app you wish to move. Select it. Then select "Move to SD". If that option doesn't appear / doesn't work. Then stock MIUI cannot move it. You will have to look towards 3rd party apps like estabien said.