I don't see why you couldn't do that. How are you installing them?
I tried MIUI Camera TEST1 (with FFC) and got a FC opening the app. My config is Samsung Galaxy S3, i9300, CM10 4.1.2 (my device board codename is "m0")
I also tried on the same device and configuration the Fixed2 version and it worked flawless.
Please maybe someone can take a look at the error report (it says something about invalid int "null")? Thanks in advance.
http://pastebin.com/5m8H7qkw
Your problem seems to be that you aren't running gingerbread, no fix for that
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The FIXED2 version works just fine and it's practically the same thing with TEST1, without FFC, so it's not an os platform issue.