I miss those days when you can write tag for files that are zipped inside a rar or zip. Will that feature be back in 0.9.2? Or is the foo_unpack component had been revamped such thing will not happen again?
P.S. I have problem opening some rar files too, sometimes it says such file type does not support.

This was not a feature of foo_unpack, but rather a quirk in the tag writing code that propagated changes to the metadata cache even though the file update was not successful.