Here is some awesome fix for MIUI Camera,now we have FlashLight in MIUI Camera too.Also something good in CM7.2 camera too,just check the screenshot under.
But I have good news come with bad news.Good news is you can have it fixed now;Bad news is I need Maik(who is sleeping now )to make a fix package that you can fix this problem via CWM,but if you can do what I say here,you don't need that package at all.
this may cause camera perview don't work in some app(like some QR scanner),if you need that app works,don't do this
File you need is HERE
1.unzip the rar file you just download and put it into your sd card;
2.uninstall "MIUICamera.apk" in system app (you can find a tool here);
3.use ROOT Explorer move file in "lib" folder to "system/lib",replace current one and set permissons to "rw-r--r--";
4.install the new MIUICamera(the one you just download);
5.reboot you phone.