Looking at the text you are referring to, the perl section mentions taint mode, which in my humble opinion is much more useful and important than safe containers. I've never had need to use a safe container - I'm also quite sparing with eval string.

Would you use it for filesystem things etc.?

I would use taint mode and untainting through a regex for these kind of operations. See Ovid's CGI course for a discussion of the security implications and an explanation of how to do this.

In terms of whether you should publish your source - this depends on your level of paranoia, and the fact that the white hats tend to out number the black hats, so you are more likely to get feedback about security holes before your application gets compromised. But, beware also the advice given in this thread.

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