Filip, I have to disagree. Battery life will be an issue for sure. I see no reason to scan such a lot of operations with “safe” files. Also intensive archive operations (like online nandroid, backups, file move/copy, etc.) will be much more slower and consume much more resources (in my opinion, waste resources). To be convinced, well, the File Shield must be restricted to a very small set of files that could bring danger to device. Otherwise, we will see complains about the resources. Well, this is my personal opinion.