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And no, don't mess around with the permissions when installing. After you have selected your ROM slot, select install and install zip.
I believe the volume extra key you were mentioning is a 4.2+ thing. I'm not planning on incorporating it into Aviator Blur, but if you want it, check out Aviator CM10.1 (click on the picture on the OP)
As for hangouts crashing, does it happen regularly? If so, I can take you through getting a log report which will help me determine the problem. If you are interested, send me a PM and I'll talk you through it
Thank you again for the info. I'll try the dirty flash now. If it goes poorly then I'll just wipe the slot and install 3.0.4.
I'm wearing of trying the CM ROM's as my friend I am speaking of is having several fairly major issues with their phone after using it. Granted they are using CM and not the Aviator CM (not sure what the differences are here) but I was just nowhere near as dazzled with how everything worked in CM over your Aviator Blur.