Comment 10 for bug 739495

Definitely +1 to this!

An alternative (and more generic) approach would be doing this by intercepting .conf file reads (via FUSE?). After thinking a little about this and googling, I've found something that might be a good start:
https://code.google.com/p/scriptfs/

@dkived: Maybe you can try this for your scenario and post how it works. I haven't tried it but looks like it can do the trick.