Well because this is a overhaul/complete skinning of the system just like HTC's Sense or Samsungs TouchWiz. You may be able to port several things into your ROM, but it won't work/act like the MIUI ROM.

The easiest way would be to mesh the MIUI ROM, with your chosen kernel and radio rom (cdma/gsm/wimax etc) ... then work your way down to add in the correct drivers/stacks for other things (like hw3d, camera, fm radio etc).

I had already read about that study and it is quite "scary" knowing whenever you play an app; it secretly switches on your gps, records the latitude+longitude, then forwards the list of gps coordinates it recorded throughout when the App was turned on straight to the app developer.

But I get it, it actually could help the app developers improve their apps or apply better ad's on to it (so the advertisers must give the app maker more money = cheaper apps).

The good thing is that their is a notification when you're installing the app ... but there should be one that say's you must manually accept it to have access to those features (like MS Vista), but also an option to (do not remind me later) so that its less frustrating.