Thanks for your work, this is a best MIUI V4 ROM so far. But has the same problems with others, this ROM can not use PIN enabled SIM card, which will fail to connect to operator netwaork. For normal SIM card without PIN code it still need to go into settings select 'automatic' to get signal. Owain's CM9 ROM doesn't have those problems.
Another question, is the superuser app come from MIUI or CM9? I'm asking that because on MIUI GB superuser app can block unnecessary permissions of downloaded apps. (i.e. I can use it to ban facebook app to access my phone state and SMS) That was one of the reason I like MIUI, but now this feature is gone.