1. Better camera app. The original camera app on my Samsung Galaxy S2 was much better. Also, it will be useful to have the ability to multitouch to zoom in/out in camera/video.
2. Option to disable lockscreen if pattern is enabled.
3. App drawer option (with enable/disable)
4. Landscape launcher view
5. Resizeable widgets
6. Option to change the icons of the apps INDIVIDUALLY (e.g. If I like the icon for ... lets say ... Phone from theme X and I want to put it in theme Y). All other major launchers have these options (Launcher Pro, ADW, GO launcher, SS Launcher, etc)
7. Option to change how dialer works (now we can answer only by sliding down). We need to have more options - sliding right, tapping and other gestures (just like on the lockscreen).
8. Option to call/send Text message like on the stock SGS2 ROM (by sliding right/left on a contact). It is very efficient.
9. Option to put folders in folders (IF we cannot be granted with an APP DRAWER).
and finnaly
10. PLEASE GIVE US THE OPTION TO HAVE AN APPDRAWER (yes, I know, I've said it before).
That's pretty much everything. These are my demands for both GB and ICS versions of MIUI.
If you can manage to implement all these in your ROM, well you'll definitely be the BEST ANDROID CUSTOM ROM TEAM EVER.
Till then, CHEERS !
A true MIUI Fan